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