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