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