1) Locate the icon you need using any of the "cheat sheets" available online, such as this one:
http://fortawesome.github.io/Font-Awesome/cheatsheet/
Make note of the Unicode string associated with the icon character. For example, the Apple icon is 
2) Tweek the Unicode string by changing the first 2 characters &# to 0 (zero) and removing the trailing semicolon, so the string reads as 0xf179.
3) Set the textFont of the control (ie a button or field) where you intend to display the icon to "FontAwesome". Then, in the case of a button, set the label property of the button using the numToCodepoint function. Example:
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set the label of button 1 to numToCodepoint("0xf179")
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set the useUnicode to true
set the unicodeLabel of btn 1 to numToChar("0xf179")