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