Theme problems header

I have been using the theme and was almost done with the site when something happened and the theme became corrupted. Now I am trying to start over and I can't get the original theme to display properly. The header image is at the top of the page and the page menus are messed up. I am trying to return it where it was in the original theme image with a feature image that spans the entire page with round page menu tabs.

It all went to pieces when I installed a contact form plugin.

Here is the site if you can help.
http://www.digitalingest.com/wordpress/