BuddyPress.org

Then explain exactly what you can’t do. You say you have enabled registrations, then what happens when you are logged out and try one of the register links? do you not get the user new user form? if you have the form what happens when you complete and submit it? see where I’m going? we need as much detail as you can supply , we can’t necessarily guess at what may be wrong.

One thing to do is disable BP and ensure WP is working as expected in all respects before proceeding to add the BP layer to it, and also disable any other plugins that may be running and that are not necessary.