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