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