In the rich text editor:
@SlugHooligan
In a comment:
[SlugHooligan](https://chowlings.com/user/SlugHooligan)
For Names and Avatars:
In the rich text editor:
%SlugHooligan
In a comment:
[![SlugHooligan's Avatar](https://chowlings.com/images/avatars/1999.png?v=1675034328)](https://chowlings.com/user/SlugHooligan) [SlugHooligan](https://chowlings.com/user/SlugHooligan)