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Amazon Prime also takes their ratings from IMDB ratings. When you go onto the IMDB webpage, you will be given an option to sign in through your Amazon account. Select this option and sign in. Movies will be displayed under categories, but you can also search for a specific movie. Type in the movie you want to rate. Click on the title when it appears. The “rate this” option will be shown above a star. Click on “rate this” and give the title as many stars as you’d like. You can rate the movie between one and ten stars.

Summary:
Sign into IMDB with your Amazon account. Select the movie you want to rate. Click on the “rate this” option to select a star rating.