try: /wp-admin/options-general.php?page=buddypress-group-css/bp-group-css.php
Ah yeah, go to your Dashboard and find “Group CSS” under Settings. Just enable the bits you need and hit Save.
I’ll move that menu to a submenu of “Buddypress” soon. It’s down in Settings for the moment because of a bug that existed in an earlier version of BP.
The behaviour you are experiencing is due to the options not being saved, and I don’t create any default options. I guess in future versions I will set all the defaults upon plugin activation. 🙂
Try again now with 3.0.1 – I juuust tested it, and it seems to work.