AirTV on Sling App of Amazon Firestick

I have an AirTV but no Sling subscription. On the Sling App on my phone as well as on my RokuTV, I can log into my free Sling account and watch the shows I have recorded using my AirTV DVR. But in my bedroom, I don't have Roku, just a Firestick. I downloaded the Sling App for Firestick, and going through the setup on it, I log into my account, but the interface won't let me continue until I pick a Sling subscription package. I suspect that if I could finish setup, everything would work fine like it does on Roku. Has anyone else had this problem, and better yet, have a solution? Thanks in advance!