In the rich text editor:
@tens
In a comment:
[tens](https://chowlings.com/user/tens)
For Names and Avatars:
In the rich text editor:
%tens
In a comment:
[![tens's Avatar](https://chowlings.com/images/avatars/1739.png?v=1665360480)](https://chowlings.com/user/tens) [tens](https://chowlings.com/user/tens)