Plugins:
For the shoutbox, you'll need https://community.mybb.com/mods.php?action=view&pid=63

If you want to make your forum invite only, https://mods.mybb.com/view/invitation-system manual update to 1.8 needed

Rename your index.php in your forums to home.php and make sure your forums isnt in your main folder put it somewhere else make a directory called /forums/ and put everything there

You will also need to edit the index.html in this directory and the forum directory and index.php with your forum name / forum links.

I also included a tos. 

Theme made by https://steamcommunity.com/id/simplerealistic/ (Dylan aka simplerealistic)