In the rich text editor:
@Kursedkitty
In a comment:
[Kursedkitty](https://chowlings.com/user/Kursedkitty)
For Names and Avatars:
In the rich text editor:
%Kursedkitty
In a comment:
[![Kursedkitty's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/Kursedkitty) [Kursedkitty](https://chowlings.com/user/Kursedkitty)