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