Please go to the following page I link you. Scroll down to the blu-ray players and choose the one you have. You will then need to log in with your amazon account. After that it will walk you through the steps. Here is the link:
At this time I need to to click the rating stars at top, please click 3 or more stars.
I should have mentioned you will need to first install the amazon prime app on the blu-ray player and if you have done that then open it and sign in with your prime account.