How do I get a refund?

This app looked really great in the previews. Well polished, functional, and attractive. In reality, it is anything but. It’s clunky, there’s no way to access messages you already have open on Facebook, and you can’t even access the Preferences panel. Absolute waste of money. I wonder if there’s any way to get a refund on purchased apps...

ChrispySaid about messenger for facebook