If the Android version is 2.X.X. please enter Google Play, find the game in question and click "My review". You can vote (1-5 stars) and write a review there. If the Android version you have is 3.X.X. please open Google Play using your browser (link: https://play.google.com/store ) and find the game you are playing. After entering your Google account you'll be able to vote (1-5 stars) and write a review.
Have more questions? Submit a request