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