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