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