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