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