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