In the rich text editor:
@Twistedlunatic
In a comment:
[Twistedlunatic](https://chowlings.com/user/Twistedlunatic)
For Names and Avatars:
In the rich text editor:
%Twistedlunatic
In a comment:
[![Twistedlunatic's Avatar](https://chowlings.com/images/avatars/2759.png?v=1695645235)](https://chowlings.com/user/Twistedlunatic) [Twistedlunatic](https://chowlings.com/user/Twistedlunatic)