In the rich text editor:
@Killehqueen
In a comment:
[Killehqueen](https://chowlings.com/user/Killehqueen)
For Names and Avatars:
In the rich text editor:
%Killehqueen
In a comment:
[![Killehqueen's Avatar](https://chowlings.com/images/avatars/190.png?v=1644063265)](https://chowlings.com/user/Killehqueen) [Killehqueen](https://chowlings.com/user/Killehqueen)