XenForo Postbit with FontAwesome

I know there are a few sites who had this working on and had tutorials (Wich i will not say because falls under the same category NulledBB is) but now they are down, i lost this precious and loved tutorial.

How can i achieve the same postbit that TAZ has (TheAdminZone), mostly the FontAwesome message elements.
If there's a tutorial i will gladly unlock it and make use of it on my site.