In the rich text editor:
@Chompii
In a comment:
[Chompii](https://chowlings.com/user/Chompii)
For Names and Avatars:
In the rich text editor:
%Chompii
In a comment:
[![Chompii's Avatar](https://chowlings.com/images/avatars/237.jpeg?v=1644063268)](https://chowlings.com/user/Chompii) [Chompii](https://chowlings.com/user/Chompii)