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