Okay then after creating the group then goto to the existing forum permissions say "Bad Man 2020"
Add zero's for the groups that should not have access for can use forum,can read threads, can create threads,can reply to existing threads. Plus whatever else you want. Then add a 1 to those fields for the new group
You can make any change you want.
Like use can see forum for all groups so they know the forum exists but can't read the topics etc.
