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