Bhost – reloating the sub navigation

I am using a modified Bhost theme. When hovering on a nav item, I would like to have the sub navigation appear directly below its parent. Right now, the sub nav appears at the bottom of the page, or not at all. I am having trouble figuring out where and how to modify the css to try and achieve this. Any suggestions would be appreciated.

At this point there is just one sub nav item on the site, located on this page:
http://www.c4kca.org/get-involved/