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[royals]

Go to your usergroups, then usergroup manager - choose a group (not the registered members) and Edit. Set options to "No" for everything on the appropriate groups.

There may be an easier way, but thats how I do it.

You can also go to Forums & Moderators - View Permissions and edit the usergroups. Deny all on the groups that aren't registered members.

whichever you want - but if you do it the 2nd way, you will need to do it for future forums.