In the rich text editor:
@S41L
In a comment:
[S41L](https://chowlings.com/user/S41L)
For Names and Avatars:
In the rich text editor:
%S41L
In a comment:
[![S41L's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/S41L) [S41L](https://chowlings.com/user/S41L)