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