Most Usergroups & Permissions tasks in vBulletin are done through the Usergroup Manager, but some also involve dealing with the individual users that make up the usergroups, and are accomplished by the User Manager, which is accessible through the Users menu.
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Another Usergroups & Permissions task involving the Users menu is managing access masks. Click Access Masks, which is the last submenu on the Users menu.
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For more information about managing access masks, see [HOP]acp_permissions_tools_accessmasks[/HOP].