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