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:
[](https://chowlings.com/user/Killehqueen) [Killehqueen](https://chowlings.com/user/Killehqueen)