vBulletin Manual - Editing Access Masks

Note:

General information on access masks is available here.

To edit a user’s access masks, go to Users > Search for Users > enter criteria that will find this user. From the search results page, select [Edit Access Masks] from the user’s profile page, select [Edit Forum Permissions (Access Masks)]. A page similar to this will be displayed:

Each forum will be listed on this page. There are three possible access masks for each forum:

Yes – this user will be granted access to the forum user his or her global usergroup permissions, regardless of any forum-level usergroup permissions.
No – this user will be denied any access to this forum regardless of forum-level usergroup permissions.
Default – no special access mask specified; user will receive access to the forum as per forum-level or global usergroup permissions.

Note:

Inheritance of permissions still works here. Therefore, if you specify yes in a parent forum, that will carry over to any child forums.

Warning:

These settings will have no effect unless you have enabled access masks in the vBulletin Options section.