Changing Forum/Topic Header Background Color

Hi, under the “Forums Index Styling” section of the plugin, I would like to change the background color of the header for the forums. I have changed it, saved and it does not apply.

http://sixerssociety.com/wp-content/plugins/bbp-style-pack/images/forums-list.JPG

I am trying to change number #2 in the picture.

The page I need help with: [log in to see the link]