changing a header image in Platform Base Version 1.4.1

I’m new to WordPress – trying to maintain our website in between two professional website managers. My boss has assigned me with the simple task of changing our header image from our old logo to our new logo. I have scoured the forums for how to do this- and I cannot for the life of me figure out WHERE the image is in the first place to change it.

Can someone please explain to me simply: where in this code is the header image and how do I change it?

This is my website:

http://www.thenovogratz.com

This is what I’m working with:

[ Moderator Note: Please post code or markup snippets between backticks or use the code button. Or next time just post a link to your CSS. ]

/*
Theme Name: PlatformBase
Theme URI: http://www.pagelines.com/themes/PlatformPro
Description: Platform Base is a Platform child theme (a WordPress child theme) designed to be edited to customize the PlatformPro WordPress framework. Use custom CSS and PHP hooks to do almost anything. Designed and developed by <a href="http://www.pagelines.com">PageLines</a>.  **IMPORTANT** For this to work PlatformPro must be called 'platformpro' (lowercase) in your themes folder.
Version: 1.4.1
Author: PageLines
Author URI: http://www.pagelines.com
Tags: buddypress, theme-options, white, silver, light, one-column, two-columns, three-columns, left-sidebar, right-sidebar, flexible-width, custom-menu, fixed-width, threaded-comments, custom-header, custom-colors, translation-ready

Template: platformpro

/* ======================= */
/* = Get PlatformPro CSS = */
/* ======================= */

/*
 IMPORTANT -  The files below need to find the actual directory of Platform. If the PlatformPro is named something other than 'platformpro' you will need to change that value below.

 ON UPDATING - 	Base shouldn't be replaced in your install with every release. It defeats the purpose of using a child theme.
				Use updates to this Platform Child Theme, as a reference to help you improve your own customizations.
*/

	/* Get Theme-Parent CSS */
	@import url('../platformpro/style.css');

/* ============================= */
/* = HOW TO CUSTOMIZE PLATFORM = */
/* ============================= */

/*

Edit this style sheet to create your own custom theme based on the Base Platform theme. 

Rules placed in this stylesheet will override the default styles of the Base Platform theme and will not be changed or over written when you update the
Platform framework. Additionally, since this stylesheet is purely for editing purposes you can easily undo or erase some of the CSS to return your site back to the look and feel of the Base theme. 

In the Base theme the footer is black and the CSS looks like this:

	#footer {
		clear:both;
		font-size:1em;
		overflow:hidden;
		text-align: left;
		background: #000;
		color: #999;
		position: relative;
	}

To change the background color to white, all you have to do is declare a new rule for the color like so:

		#footer { background: #FFF; }

A great tool for modifying themes and inspecting CSS elements is the FireBug extension for FireFox. You can also use the developer tools provided by Chrome (right-click and "inspect element") or Internet Explorer if you're feeling dangerous.

LEARN CSS - We recommend using Lynda.com video tutorials to learn using CSS.
			Also, for a comprehensive list of CSS rules and usage try consulting W3 schools @ http://www.w3schools.com/css/default.asp

ON UPDATING - 	Base shouldn't be replaced in your install with every release. It defeats the purpose of using a child theme.
				Use updates to this Platform Child Theme, as a reference to help you improve your own customizations.
*/

/* ============================== */
/* = Start Your Custom CSS Here = */
/* ============================== */

H2.posttitle A
{
	font-size: 12pt;
}

@import url(http://fonts.googleapis.com/css?family=League+Script);

/* @ CSS corresponding to the hook used in functions.php; adds a stumbleupon icon to branding section */

.icons .stumbleupon {background: url('../platformpro/images/sprite-socialicons.png') no-repeat -176px 0;}
.icons .stumbleupon:hover {background: url('../platformpro/images/sprite-socialicons.png') no-repeat -176px -22px;}

/* @ Pullquote Section */

#pullquote.copy{
	background: #f7f7f7 url(images/pullquote.png) no-repeat 15px 15px;
	padding: 15px 20px 15px 45px;
	margin-bottom: 1.5em;
}

	#pullquote .thepullquote{font-size: 1.5em;margin-bottom: 5px;line-height: 1.3em;}
	#pullquote .thecitation{color: #AAA; font-style: italic;padding-left: 15px;}

/* Primary Font Style */
		body, .font1, .font-primary, .commentlist, input{
			font-family:Arvo, 'Times New Roman', Times, serif;
		}

	/* Header Font Style */
		h1, h2, h3, h4, h5, h6, .site-title{
			font-family:Arvo, 'Times New Roman', Times, serif;
		}

	/* Secondary Font Style */
		.font2, .font-sub, ul.main-nav li a, #secondnav li a, .metabar, .subtext, .subhead, .widget-title, .post-comments, .reply a, .editpage, #pagination .wp-pagenavi, .post-edit-link, #wp-calendar caption, #wp-calendar thead th, .soapbox-links a, .fancybox, .standard-form .admin-links, #featurenav a, .pagelines-blink, .ftitle small, .button, input[type="submit"], input[type="button"], input[type="reset"], .submit{
			font-family:Arvo, 'Times New Roman', Times, serif;
			text-transform: uppercase;
			letter-spacing: .1em;
		}

		input[type="text"], input[type="password"], textarea, #dsq-content textarea{ font-family: "Courier New", Courier, Verdana, sans-serif; }

#header .searchform { margin-right: 30px; color: #737373; }
#header .searchform fieldset input { color: #94909a; }

#cred, .tbubble, ul li.cat-item-17, ul li.cat-item-11, ul li.cat-item-12, ul li.cat-item-13, ul li.cat-item-14, ul li.cat-item-1 { display: none; }
#linkcat-7 .xoxo li { display: inline;}

#linkcat-7 h3 { color: #fcca76;}
#linkcat-8 .xoxo li { line-height: 12px;}
#linkcat-8 h3 { color: #0f89bd; font-size: .8em; text-transform: none;}
#linkcat-8 .widget-pad { border: none; padding-top: 0;}
.widget-title { font-size: 1.7em; color: #94909a;}
.widget ul { padding: 0; margin: 0; }
.current-menu-item #menu-item-31 { color: red; }
.fpost .post-excerpt, .fpost .entry_content { color: #39383b; font-size: 1.0em; line-height: 1.0em; }
.addthis_toolbox { border-top: 1px solid #60b8c1; border-bottom: 1px solid #60b8c1; padding: 10px 0; margin: 20px 0; clear: both; height: 20px;}

.post-nav, .current_posts_info, .post-footer { border: none; width: 150px; }
.right { float: right; }
.entry-title { float: left; }
.metabar { float: right; }
.metabar .date { font-family: League Script, 'Times New Roman', Times, serif; color: #ff842a; font-size: 2.2em; text-transform: none; line-height: 50px;  }
.post-title { background: url('http://www.thenovogratz.com/wp-content/uploads/2011/06/headerbarwstitching659.png') 0 0 no-repeat; padding: 10px 20px; }
.post-title h1 { color: #1f9cad; text-transform: none; font-size: 2em; line-height: 50px;}
.entry_content h3 { text-transform: uppercase;}
.entry_content img { margin-bottom: 20px; }
.post-thumb2  { background: #e1e4dd; padding: 6px; margin: 10px 0 10px 10px; float: left;}
.post-thumb2 a { color: #1f9cad; clear: both;}

.copy-pad .fpost {  display: inline;  }
.page-nav-default { border-top: 1px solid #B7B6B2; margin-top: 20px;}
.page-nav { clear: both; width: 595px; margin: 0 10px;}
body { padding: 0; }
#menu-item-33, #menu-item-32, #menu-item-34, #menu-item-2409, #menu-item-2408, #menu-item-2411   { background: #faf9f6; }

#feature_slider { margin-bottom: 30px; }
.ftext .fexcerpt .addthis_toolbox { display: none; }
#feature_slider .fcontainer .fcontent h1, #feature_slider .fcontainer .fcontent h2, #feature_slider .fcontainer .fcontent h3, #feature_slider .fcontainer
.fcontent { color: #FF842A; }
.fheading h2.ftitle {  font-size: 1.5em; text-transform: uppercase;}
#feature_slider .fcontent { text-shadow: none; }
#feature_slider .text-bottom .fcontent .fheading { width: 100%; background:none; }
#feature_slider .fcontainer.text-bottom .fcontent { height: 120px;width: 559px; margin: 30px; bottom: 290px;}
#feature_slider .text-bottom .fcontent .ftext { padding: 0; width: 100%; color: #737373; font-size: 1.2em; margin-top: 10px; }

a.pagelines-blink.black-blink, #feature_slider .fcontent a, #feature_slider .fcontent a.post-edit-link { Border: none; }
#feature_slider .text-bottom .fmedia { border: 18px solid #e0e3db; width: 623px; height: 444px;}
blockquote { background: #e0e3db; border: none; width: 80%; margin: 0 auto; text-align: center; margin-bottom: 6px;}

.current_posts_info { background: url('http://www.thenovogratz.com/wp-content/uploads/2011/06/smalllinenbar.png') 0 0 no-repeat; font-size: 1.5em; color: #ff842a; height: 60px; width: 659px; line-height: 50px; text-transform: uppercase; padding-left: 24px;}
.entry_content h2 { background: url('http://www.thenovogratz.com/wp-content/uploads/2011/06/smalllinenbar.png') 0 0 no-repeat; font-size: 1.5em; color: #ff842a; height: 60px; width: 659px; line-height: 60px; text-transform: uppercase; padding-left: 40px; padding-bottom: 10px; border-bottom: 1px solid #b7b6b2; }

#theloop, #postnav, .widget-pad { border-top: 1px solid #b7b6b2; padding-top: 10px; }

#postsinfo  { border-top: 1px solid #b7b6b2; padding-top: 10px; height: 70px; }
.post-title h1 { color: #1f9cad; text-transform: none; font-size: 12pt; line-height: 50px;}
.post-title-blog h2 a, .post-title-section h2 a { color: #1f9cad; text-transform: none; font-size: 1.1em; line-height: 50px; }
.post-excerpt { clear: both; }
.post-title-blog .post-thumb img, .post-nothumb .post-thumb-search, .post-thumb-search img { float: none; margin: 0 auto; text-align: center; background: none;}
#categories-3 h3 { color: #62bac5; }
#tag_cloud-3 h3 { color: #ec854e; }
#archives-3 h3 { color: #5f627d; }

#branding .content-pad { padding-top: 0; }
#branding .branding_wrap { text-align: center; margin: 0 auto; }

#primary-nav ul.main-nav { width: 700px; }
.sf-menu { font-size: 1.5em; }

.main_nav .main-nav li a:hover, #wp-calendar thead th, #buddypress-page #object-nav, .item-avatar a, .comment,  #grandchildnav .current_page_item a, #grandchildnav li a:hover, #grandchildnav .current_page_item  ul li a:hover, #carousel .carousel_text, pagination .wp-pagenavi a, #pagination .wp-pagenavi .current, #pagination .wp-pagenavi .extend, .sf-menu li:hover, .sf-menu li.sfHover, #featurenav a, #feature-footer span.playpause, .content-pagination .cp-num, .content-pagination a:hover .cp-num, ins{ background-color: transparent; color: #ff842a; }

ul.sf-menu ul.sub-menu, ul.sf-menu ul.children { background: transparent; border: 1px solid #b7b6b2; }

hr, .fpost, .clip_box, .widget-title, #buddypress-page .item-list li, .metabar a, #morefoot .widget-title, #site #dsq-content h3, .post.fpost .entry, #soapbox .fboxinfo, #primary-nav #nav_row, .fpost.sticky { border: none; }
.fpost .post-thumb img, .clip .clip-thumb img, .author-thumb img { border: none;}
.sf-menu li, #primary-nav ul.sf-menu a:focus, .sf-menu a:hover, .sf-menu a:active, .commentlist ul.children .even, .alt #commentform textarea {background: transparent; }

.post-nav .previous a { padding-right: 10px; border-right: 1px solid #ccc; color: #519496;}
.post-nav .next a { padding-left: 10px; color: #519496;}

#primary-nav .current-menu-item a, #primary-nav .current-page-item a, #primary-nav .current-menu-parent a  {color: #1f9cad;}

#blocks ul { margin: 30px 0 0 0; padding: 0; }
#blocks li { float: left; list-style: none; padding: 0 5px; }

#feature-area, .feature-wrap, #feature_slider .fmedia, #feature_slider .fcontent, #feature_slider .text-bottom .fmedia .dcol-pad, #feature_slider .text-bottom .feature-pad, #feature_slider .text-none .fmedia .dcol-pad, #feature-footer .feature-footer-pad,#feature-footer {
width:659px;
}
.entry_content img { padding-right: 10px; }
#carousel { border-top: 1px solid #B7B6B2; border-bottom: 1px solid #B7B6B2; }

#feature { border-top: 1px solid #B7B6B2; margin: 0; padding-top: 10px; }
#text-4 { margin-bottom: 0; }

ul.blogroll li a:hover { text-decoration: none; }

#sidebar-wrap #sidebar_universal { padding: 0; }

.category-press #list_sidebar_universal, .category-online #list_sidebar_universal, .category-print #list_sidebar_universal, .category-video #list_sidebar_universal { display: none; }
a.pagelines-blink, a.soapbox_link, #feature_slider .fcontent a.post-edit-link, .button, input[type="submit"], input[type="button"], input[type="reset"], .submit { text-shadow: none; color: #e1e4dd; border: none;}

/* Shopping */
.wpsc_checkout_table h4 { color: #FF842A; }
.wpsc_checkout_table td, .wpsc_email_address, .checkout_cart, .productcart { background: #fff; }
#checkout_page_container .total_price .total_shipping .wpsc_totals { padding-left: 0; }
.wpsc_make_purchase { margin-top: 20px; }
#checkout_page_container table.checkout_cart tr.header th { background: #e1e4dd; text-align: left; padding-left: 10px;}
#wpsc_checkout_form_9 { width: 250px; }
.FB_like { height: 50px; }
.product_description p { padding-left: 2px;  width: 400px; font-style: italic;}
.wpsc_buy_button { background: #ff842a; }
.single_additional_description { padding-left: 10px; }
.wpsc_checkout_form_20 { width: 150px; }
.price_container, .grid_more_info { display: none; }
#grid_view_products_page_container h4 { text-transform: uppercase; font-size: 1.1em; text-align: center; width: 200px;}
.wpsc-product .post-header .metabar, .st_sharethis, .wpsc_email_address_p img {  display:none;}
.wpsc-product .entry_content img { padding: 0; }
.wpsc_product_price p { padding: 8px 0; }
.wpsc-shopping-cart .entry_wrap h2 { width: 640px; background: none; background-color: #fff; border-bottom: none; padding: 0; text-transform: none; font-size: 1.3em; padding-left: 10px; }
#checkout_page_container  h3 { color: #FF842A; padding: 10px; margin: 10px 0;   background: #fff;}
#wpsc_shopping_cart_container table td { text-align: left; }
.wpsc_change_country { height:50px; }
.wpsc_change_country input { float: right; }
#current_country, #region { margin: 5px; float: left; }
#zipcode { float: left; }
#cart { float: right; margin-right: 20px; }

H2.posttitle A
{
	font-size: 12pt;