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