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