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