Including the Font Awesome Library
First, you need to include the Font Awesome (FA) library. You can either download it from the FA web site and store it in a sub-folder in your Logi app's _SupportFiles folder, or link to it directly.

Examples of both approaches are shown above. For a local copy of the library, use this path to the FA style sheet:
_SupportFiles/font-awesome-4.5.0/css/font-awesome.min.css
To use the online version instead, use this URL:
https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css
You can also use any of the standard Logi built-in Themes with the FA library.