From CEGUIWiki

Forum Mail problems

If you have registered to the forums, but didn't receive an activation email yet, please send an email to this addess and mention your username: team@cegui.org.uk

Cegui related issues

For help on CEGUI related issues search the forum [1] and/or get out your IRC-client and join #cegui on the freenode-network[2]. If you dont know what is or how to access IRC, install Firefox [3] and its plugin ChatZilla [4]. Then you can join the channel by simply clicking here [5].