In the rich text editor:
@fawncore
In a comment:
[fawncore](https://chowlings.com/user/fawncore)
For Names and Avatars:
In the rich text editor:
%fawncore
In a comment:
[![fawncore's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/fawncore) [fawncore](https://chowlings.com/user/fawncore)