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