How do I not allow anonymous users to view the forums, or only allow them to access certain pages that have been created?

In phpBB, you can hide forums and only allow certain users to view them. I need either to figure out how to do that, or be able to hide the forums all-together while still allowing anonymous users to view other content (such as pages I've created).

I've looked through the Drupal administer area for an hour or so now and I still can't figure it out... There's gotta' be a way!

Please help ASAP.

Thanks!