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