In the rich text editor:
@Uri
In a comment:
[Uri](https://chowlings.com/user/Uri)
For Names and Avatars:
In the rich text editor:
%Uri
In a comment:
[![Uri's Avatar](https://chowlings.com/images/avatars/1447.png?v=1655866476)](https://chowlings.com/user/Uri) [Uri](https://chowlings.com/user/Uri)