1. First you tap on the Google Play store icon that is found in your homescreen or app gallery.
2. Once the app is open, click on the three vertical dots in the top right corner, which will bring you to ''Settings''.
3. In ''Settings'', go under ''User controls'' where you can set or change your PIN. This is made of 4 digits, just like with your bank card. As of now, these are needed at any moment when you would like to change any of your Google Play settings
4. The next step is to ensure that this PIN will be requested everytime you want to make a purchase. You do so by checking the ''Use PIN for purchases'' box found right under ''User Controls''. Now your wallet can breath easy knowing that no small fingers will be purchasing paid apps any time soon
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