Permissions are various access rights granted to users or usergroups.
vBulletin organizes permissions for various functions with a usergroup system. Default usergroups include Administrators, Super Moderators, Moderators, Registered Users and Guests.
You can use the Usergroup Manager to edit the various permissions for each group, and to add new usergroups to create a permissions system unique to your site.
You can access the Usergroup Manager from various links in the Usergroup menu, for example, Usergroup Manager and Add New Usergroup.
Also accessible from the Usergroups menu is the Administrator Permissions Manager, which allows Super Administrators to limit the powers of their co-administrators.