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