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