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