How do I set up my profile?

Account → Profile. Your profile is what other members see: your nickname, your picture, and the posts, comments and likes you have made public.

Filling it in is also one of the things points are awarded for, so it is worth doing once properly. Your own profile page collects your posts, your comments, what you liked and what you bookmarked, which makes it the quickest way back to something you remember reading.

Nickname changes and the email on your account are handled in the Account section of Creta and apply everywhere, not just here.