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