In the rich text editor:
@Kirwick
In a comment:
[Kirwick](https://chowlings.com/user/Kirwick)
For Names and Avatars:
In the rich text editor:
%Kirwick
In a comment:
[![Kirwick's Avatar](https://chowlings.com/images/avatars/234.png?v=1644063268)](https://chowlings.com/user/Kirwick) [Kirwick](https://chowlings.com/user/Kirwick)