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