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