C‑EDD: Estimated Delivery Date

This app has a great look and customer service was quick to respond, but I cannot figure it out for the life of me. I've tried and tried and it just seems unreliable on the products it shows on and doesn't show. They emailed back directions, but I could not figure out the steps they sent and it's just not user friendly (at least for me). I was excited about this one as I've tried several, but I just cannot get this to work for me. :(