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