In the rich text editor:
@SweetDumpling
In a comment:
[SweetDumpling](https://chowlings.com/user/SweetDumpling)
For Names and Avatars:
In the rich text editor:
%SweetDumpling
In a comment:
[](https://chowlings.com/user/SweetDumpling) [SweetDumpling](https://chowlings.com/user/SweetDumpling)