Different Headers

I read the instructions for setting a featured image as a header in Mantra, but I’m unable to get it to work in Parabola.

I simply put an image at the top of all my pages to create a header, but cannot do that for the posts’ page. Anyone have a solution? This is the posts’ page now.

This is the page I want the header on. I don’t need the magazine layout, if that will make a difference: http://cathistevenson.com/word/independent-author-blog/