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