Thanks! And uhh.. you can't really, sorry. I didn't really think of that before submitting. Part of the learning process was to create a paid app and learn about the forms and processes required by Apple and Google to sell paid apps.

If you would like a promo code, let me know and I'll set you up!

I think that feature is built in the Android Play store. From what I understand you can get a refund if you don't like the app.