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