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