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