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