PHPBB How can I make a forum that only certain members can see?

I have a forum that is used for development of a large project. I have made some members, some moderators, and a couple admins. This has worked well, but now I need another group, so I need to have a 4th level

Is the easiest way to do this via the groups admin? and if so, how do I set it so that only certain groups can see certain forums?

Thanks for any help in advance.

 

You can post the post at www.phpbb.com for help also.

 

Thanks, I already worked it out though. It was a case of if all else fails RTFM I did and it worked