Create A Forum - Support Forums

You have to make a new permission profile

Under  Manage Permissions => Edit Profiles

Under New Profile -> creat a profile.

Next, click on the profile under edit profile to edit it.
Change each membergroup where needed.
And look at these settings
 * Post topics and replies to the board    

^^ Make sure those unchecked

* Post topics and replies to the board only after they have been approved



Last modify the board and assign that permission profile to it.