Hi Lisa,
Can you please confirm that you have read the templates guide on our site?
http://www.joomlajunkie.com/help/guides/template-guide-absolute.html
It covers installing the template, installing and setting up the modules, and changing the templates configuration.
Also, to modify the headers, simply create your own (with your logo) and then name them the same as the current and replace them.
The templates Fireworks source file is also included, so if you need to make any graphical changes, you can do that too.
Hope that helps
Cheers,
Chris