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