Well let's see. You could delete the blogs you don't want or feel a need for. That would probably leave you with one blog ;)

But hey you should always have at least 2 blogs. One for your blogging, and the other for the ever-popular "list 'o links" blog which b2evolution calls a linkblog. Others have called it a blogroll. But hey in truth you don't need it so yeah just delete the blogs it installs if all you want is one blog.

So which files do I delete? I don't see any files named "linkblog" or "blogb" or "bloga".

:(

No files - delete or add blogs through your back office (admin) area on the "Blog settings" tab.