In the rich text editor:
@fluffbeak
In a comment:
[fluffbeak](https://chowlings.com/user/fluffbeak)
For Names and Avatars:
In the rich text editor:
%fluffbeak
In a comment:
[![fluffbeak's Avatar](https://chowlings.com/images/avatars/579.png?v=1644063309)](https://chowlings.com/user/fluffbeak) [fluffbeak](https://chowlings.com/user/fluffbeak)