BuddyPress.org

Kit-

That is correct. Make a copy of the bpmember theme, rename your copy, make whatever changes you want to it, and you have–in effect–a custom theme! Just make sure you keep your new theme in the /wp-content/bp-themes/ directory.

Once ready for use, log into WPMU’s backend and navigate to “BuddyPress > General Settings > Select theme to use for BuddyPress generated pages”. You should see your newly-named theme as an option in the dropdown box. Select it, save, and you’re ready to go.

It’s worth doing and it is easy.