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