Then change the url to
http://xxx.xxx.com/cgi-bin/cp.cgi

I did find the cp.cgi url and can now edit the moderators and forums.

Thanks a lot for your help!!

Otay. Good deal.
In the future post in the classic forum if you need more help.
I will be moving this topic there.

As one of the only foremost "experts" of UBB.Classic that still hangs around here (and retains minimal information about it) I'd highly advise at least running a current build rather than what you're using, I know there was a security issue for older versions of Classic.