Social Icon..How to add other?

Hello, Everyday i grow my knowledge on the Chicago Theme and probably will be the time which free version will be completed (as a videogame) and then i'll have to upgrade to pro... A questions: I had read the guide: How do I add the Social Links to Social Menu? # How to add other personal icons? At example the icon for a Chat or for a Forum or other... Is that in pro version? Best regards, Luca