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