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