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