In the rich text editor:
@22mg
In a comment:
[22mg](https://chowlings.com/user/22mg)
For Names and Avatars:
In the rich text editor:
%22mg
In a comment:
[![22mg's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/22mg) [22mg](https://chowlings.com/user/22mg)