You’ll most likely want to create some test accounts so you can explore the various social features of BuddyPress.  To do this you will need to enable registrations.

After you’ve finished testing your network, you can disable registration until you’re ready to accept new users.

How you enable registrations on a BuddyPress network depends on whether you are using:  WordPress Multisite  or a single install of WordPress

Enabling registration

Enabling registration on BuddyPress / WordPress Multiste network is exactly the same as on a standard WordPress mutlisite network.

It’s as simple as:

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See Next: About The BuddyPress Admin Bar