In the rich text editor:
@Moss
In a comment:
[Moss](https://chowlings.com/user/Moss)
For Names and Avatars:
In the rich text editor:
%Moss
In a comment:
[![Moss's Avatar](https://chowlings.com/images/avatars/1026.png?v=1655941959)](https://chowlings.com/user/Moss) [Moss](https://chowlings.com/user/Moss)