I have found that only a few of the FontAwesome icons work. I was doing some research and looked at the source code used on your site and it looks like you’ve got some version of 4 setup. Can you help me figure out what I can do to enable version 5? That will expand the icon pool tremendously. I don’t really know HTML or CSS and I don’t want mess anything up making changes.
Here is a link I found that might explain the issue and fix: