XF 1.5 Font Awesome Explanation?

So... I paid for an add-on to get Social Media Icons in the header. The icons are I guess Font Awesome. How do I get these? Where do I put them? Thanks in advance.
This is more of a question about Font Awesome though. What is it? Where do I get it? It doesn't come with Xenforo, but it doesn't appear to be an add-on?