In the rich text editor:
@Khaotic
In a comment:
[Khaotic](https://chowlings.com/user/Khaotic)
For Names and Avatars:
In the rich text editor:
%Khaotic
In a comment:
[](https://chowlings.com/user/Khaotic) [Khaotic](https://chowlings.com/user/Khaotic)