Hip Hop Forum

I tried to make a hidden forum for the admins/mods to use to discuss matters between ourselves and whatever, but I cant seem to figure out how to make it hidden. Also, I cant find how to make the forum where only mods and admins can post in it without doing a password.

Can you help me out with this?

Forums > Forum Permissions > Name of Forum

Edit permissions for the group administrators and mods.

Give them full access and don't give anyone else any.

Thank you very much.