UBB.threads PHP Forum Software Community Forums UBB.threads 7 Version 7 Support Moving member between groups - 'users' not available

I may not understood the new way the 'users' are being held on the new version.
Looks like I can't remove the users from that group.
Is there any explanation on how the groups work?
I like the feature where I can move to/from groups when the users reach certain post count and I will use that feature, but how can I remove the user from the previous group?
Like:
on registration = newuser
after 5 posts = users
after 50 posts = activeuser

but I want to remove the user from the previous group.