Trying to add "grab code" html to post- not working?

I am using the Crystal theme/genesis.

I am trying to add some html code that readers can grab to add to their blogs. New to WordPress but in the past on my other site I just used:

<textarea> html code here </textarea> and then the html code shows up in a box that scrools.

Trying to add it on my posts now in WordPress it just strips the code away and displays the actual object!

I tried <code> and <pre> still didn’t work! Looked like this:

<code><a href="http://www.blogaholicdesigns.com/" target="_blank"><img src="http://images.blogaholicnetwork.com/buttons/breast%20cancer/Save%20Them%20All.png" alt="Blogaholic Designs”=" /></code>

How can I add html code to a post- html code that displays as html code?

Example here: http://blogaholicdesigns.com/free-fall-blog-buttons/

The button on the right should be code not the actual button?