In order to add people to a group besides superadmin, admin, or operator, you will need to add them manually to /data/ULib/users.txt. Just copy the format for one of your admins and change to group.
Also note that new groups only have access to commands that standard users have access to. So instead of adding a deny list to the vip group, you will want to add an allow list with everything they should be able to use.