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