Is there an Overview of Atahualpa?

First let me say this theme is the best I've come across in years. I have set it up on 2 sites: http://www.matthewmuller.com and the main site I work on at http://www.buchanan.org/blog

What I cannot seem to find in the forum is a section dedicated to describing what to edit in Atahualpa that I would normally do in a standard WP file.

For example: I want to edit the WP file: search.php to add:

Which file should I edit in Atahualpa?

Thanks for a terrific theme. The code is so clean, the XHMTL so very valid, it almost brings me to tears of joy!