In the rich text editor:
@cattyrunes
In a comment:
[cattyrunes](https://chowlings.com/user/cattyrunes)
For Names and Avatars:
In the rich text editor:
%cattyrunes
In a comment:
[![cattyrunes's Avatar](https://chowlings.com/images/avatars/724.png?v=1644063323)](https://chowlings.com/user/cattyrunes) [cattyrunes](https://chowlings.com/user/cattyrunes)