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