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