In the rich text editor:
@stardonyx
In a comment:
[stardonyx](https://chowlings.com/user/stardonyx)
For Names and Avatars:
In the rich text editor:
%stardonyx
In a comment:
[![stardonyx's Avatar](https://chowlings.com/images/avatars/148.png?v=1655941942)](https://chowlings.com/user/stardonyx) [stardonyx](https://chowlings.com/user/stardonyx)