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Just go to the movies and tv section and you should see an offer for half off a movie rental. Click the deal to add it to your profile. You don’t have to use it until January 17th. Adding the offer to your profile will apply the deal to the first movie you rent between now and January.
Also a pro-tip – if you have an Android device, you should be using the Google Opinion Rewards app to get free credit on your account, which is what pays for all my movie rentals from Google. The surveys are short. Most take me about 10-20 seconds to complete.