In the rich text editor:
@d3vilr4t
In a comment:
[d3vilr4t](https://chowlings.com/user/d3vilr4t)
For Names and Avatars:
In the rich text editor:
%d3vilr4t
In a comment:
[![d3vilr4t's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/d3vilr4t) [d3vilr4t](https://chowlings.com/user/d3vilr4t)