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