Blog template

Hello,

I recently installed Avata and I like everything it does for the frontpage, but I seem to have no control over the other pages on the site. I want to have a visible header/banner on my blog page but have no idea how to do that with Avata. Presently, the page is basically blank aside from the logo and menu, can I change the header background color or add an image? Any suggestions?

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