[@mercime Participant 14 years, 10 months ago]

@OHAAT first, bbPress the plugin is no longer in beta, it is now stable version 2.0.2. The topic above was 4 months 2 weeks ago.

To totally uninstall the forum for groups, backup DB and the bb-config.php that was created at root of your WP install. Then delete that bb-config.php at root. For more info about installing sitewide forums (bbPress plugin) check out https://codex.buddypress.org/getting-started/installing-group-and-sitewide-forums/