Having some trouble with this myself.
Tried this with no avail. Using Graphene and just need to remove sidebar on BP pages. http://www.stThomasBBQ.org
I installed graphene first, then installed BP when I found it.
also tried this PHP code http://buddypress.pastebin.com/tkUDryN3 , added it to buddypress sidebar.php
I know a little css and php, but not sure what to try now.
