In the rich text editor:
@Faoin
In a comment:
[Faoin](https://chowlings.com/user/Faoin)
For Names and Avatars:
In the rich text editor:
%Faoin
In a comment:
[![Faoin's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Faoin) [Faoin](https://chowlings.com/user/Faoin)