You started out by saying "A user" but now you are talking about usergroups, search for CYB forum permissions, but to be honest you'd be better off going the permissions route with vb
I'm still talking about user ID, I just pointed out this is the only way I know of how it can be done in default vb. However it requires a lot of changes, and it only applies to one single user so I don't want to do that.