MyBB Community Forums

So how do I upload font awesome on my board, and how do I use them?

http://community.mybb.com/thread-156711.html

have a look at this thread it will help you 

and if you want to use font awesome internally then

<link href='//maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css' rel='stylesheet' type='text/css'>

instead of using external link you may set a path where you upload font awesome files