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