In the rich text editor:
@Marzi
In a comment:
[Marzi](https://chowlings.com/user/Marzi)
For Names and Avatars:
In the rich text editor:
%Marzi
In a comment:
[![Marzi's Avatar](https://chowlings.com/images/avatars/17.png?v=1644063263)](https://chowlings.com/user/Marzi) [Marzi](https://chowlings.com/user/Marzi)