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