In the rich text editor:
@heartgems
In a comment:
[heartgems](https://cometcrashers.org/user/heartgems)
For Names and Avatars:
In the rich text editor:
%heartgems
In a comment:
[](https://cometcrashers.org/user/heartgems) [heartgems](https://cometcrashers.org/user/heartgems)
