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