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