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