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i looked around in the admin section (for newbb2) and i don't see any setting for the forums for adding/deleting permissions to specific users. i'd try creating a new group for this purpose and setting permissions for the group on the forum's admin page. to set the access permissions for users on newbb2:
1) Go to Forum > Forums from the admin sidebar.
2) Click the edit icon for the forum you'd like to set permissions for.
3) At the top of the page, beside "Global Access Level", check the groups that you'd like to have permission to access the forum.
4) Click Submit at the bottom of the form to save your settings.
Well, i hope that helps. good luck with your site!
-zimmi88 =)