Guests and Administrators Only Forum

[Houka Ryuu]

Is there any way to make a forum accessible by Guests and Administrators only? I have a forum already created but I currently have Members able to access the forum. I would like for the Members not to access the forum at all but have the Guests and Administrators able to access it and even make posts in it. Is that possible?

I've tried messing with the Permissions but it will not let me select just the Guests and the Administrators groups to have access to the forum. Whenever I click on the Guests permission, it always automatically checks the Members group and all the other groups as well.