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