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