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