In the rich text editor:
@awu4
In a comment:
[awu4](https://chowlings.com/user/awu4)
For Names and Avatars:
In the rich text editor:
%awu4
In a comment:
[![awu4's Avatar](https://chowlings.com/images/avatars/1345.jpg?v=1646935161)](https://chowlings.com/user/awu4) [awu4](https://chowlings.com/user/awu4)