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