In the rich text editor:
@tusk
In a comment:
[tusk](https://chowlings.com/user/tusk)
For Names and Avatars:
In the rich text editor:
%tusk
In a comment:
[![tusk's Avatar](https://chowlings.com/images/avatars/105.png?v=1644063248)](https://chowlings.com/user/tusk) [tusk](https://chowlings.com/user/tusk)