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