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