In the rich text editor:
@Krostata6
In a comment:
[Krostata6](https://www.whistlercrest.com/user/Krostata6)
For Names and Avatars:
In the rich text editor:
%Krostata6
In a comment:
[](https://www.whistlercrest.com/user/Krostata6) [Krostata6](https://www.whistlercrest.com/user/Krostata6)