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