I created a MyBB forum today. It's my first time doing it so I'm clueless.

I installed it with Softaculous. I created the directory "forum" for it to be installed in. I can navigate to "mydomain.com/forum" fine and there's no problem, mys forum is sitting there fine. But when I just go to "mydomain.com" there's a blank page. I want "mydomain.com" to redirect to "mydomain.com/forum".