Need help looking for a Mod/Plugin for IPB Forums

Unsure where this goes in NulledBB so I apologize.
I'm looking for a mod for the invision power board; and unsure where to look, or if there is a mod/plugin for what I need.

I'm looking to add a age appropriate forum, but unsure how to add it to "members groups" or make the forum (age restricted)

I use this site http://vbulletin-mods.com they have IPB mod's also