In the rich text editor:
@huggie
In a comment:
[huggie](https://chowlings.com/user/huggie)
For Names and Avatars:
In the rich text editor:
%huggie
In a comment:
[![huggie's Avatar](https://chowlings.com/images/avatars/1997.png?v=1677011173)](https://chowlings.com/user/huggie) [huggie](https://chowlings.com/user/huggie)