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