Drupal 6.3 Organic Groups + Forums

I have a Drupal 6.3 site with Organic Groups and Forums installed. I need each group to have about 6 forums each that can only be accessed by the members of that group. I have been playing with it for quite a while and I am stumped. I need some one to walk me through it. When this project is done. I need to start working on a new project: How people get access to these groups at the point of registering. But for now, I just need group members to have access to group only forums.