In the rich text editor:
@Zero20ne
In a comment:
[Zero20ne](https://www.whistlercrest.com/user/Zero20ne)
For Names and Avatars:
In the rich text editor:
%Zero20ne
In a comment:
[](https://www.whistlercrest.com/user/Zero20ne) [Zero20ne](https://www.whistlercrest.com/user/Zero20ne)