Help with understanding how BuddyPress main pages work

I set up a BuddyPress site on a single WP installation. I am getting two Home pages, one I customized and one I can't seem to do anything with. I just get this error on the default Home page along with a search option:
Not Found
Sorry, but you are looking for something that isn't here.

How do I get to each of the BuddyPress pages to customize them? I tried to do this with the Home page by setting up a page called "Home" to customize it -- probably where I am getting the duplicate.

Where is good documentation on BuddyPress and how it works internally.