Signup permission

I'd like to limit signups to invite only. That is, I have a specific group of people whom I want to join my forum, and I don't want anyone else to be able to sign up or view this forum, but I can't find that functionality anywhere. Is it at all possible, if so, how?

Thank you for your time.

Unfortunately we don't have an invite registration system but you can make registration approved by Admins only. So when someone registers you can chose whether to accept them or not.

ACP(Admin Control Panel) > Users and Groups > Users > Users options > Members > New accounts activation : Admin

Okay. Thanks for the reply.  
I'll give that a shot.

To make the forum private, not visible to guest, do these:

Administration Panel > General > Forum > Categories & Forums
Modify the permissions for each forum.  Uncheck the boxes for guests.  Make sure that you click the advanced mode link at the bottom of each permission page.

Administration Panel > Users & Usergroups > Special Rights
Modify the boxes for the ones you want.

Topic marked solved ; archived.

If you have anymore questions, feel free to open a new topic.