In the rich text editor:
@revenge
In a comment:
[revenge](https://chowlings.com/user/revenge)
For Names and Avatars:
In the rich text editor:
%revenge
In a comment:
[![revenge's Avatar](https://chowlings.com/images/avatars/64.png?v=1644063318)](https://chowlings.com/user/revenge) [revenge](https://chowlings.com/user/revenge)