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