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