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