Custom Header Photos

Hey all, I have read all of the answers to this same question, and I learned a lot, but still have a question. I uploaded the theme, it is fantastic, figured out from you all here that I needed to get an FTP acct from my host and access a client (Filezilla). I'm in Filexilla, and I simply cannot find the files for Atahulapa, and I've been trying for like three hours seeking resources and racking my brain. Can anyone tell me exactly where I'd find them? I downloaded the theme initially from the WP admin panel but then actually deleted it and uploaded it off the web to my computer directly so I know they are there, the zip file is in my Documents and the blog is up. Thanks for any help you can give me, it is a standout theme or I would have given up already.