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