It's cool that you have installed another Amazon app. I also use the Amazon Fire TV Stick, but I found a way to use the Firestick streaming device without overpaying for apps in the Amazon store. I was surprised to find a way to unblock free software and sites that works well with my Fire TV Stick. You can do it with ease, too. But before trying this, you should note that
third-party free movie apps must be sideloaded on Firestick. There is a lot of information and reviews of similar programs on the Internet, so you can always check it out.