In the rich text editor:
@zclabu
In a comment:
[zclabu](https://chowlings.com/user/zclabu)
For Names and Avatars:
In the rich text editor:
%zclabu
In a comment:
[![zclabu's Avatar](https://chowlings.com/images/avatars/default.jpg)](https://chowlings.com/user/zclabu) [zclabu](https://chowlings.com/user/zclabu)