You need to add a Google account to your device, either one you already had or a new one, and that will be your device’s account until you change it. Then you go to https://play.google.com (if you want to browse it on a computer) or open the Google Play Store app. Afterwards you select an item, then you chose to install (if it’s free) or buy it. Finally just follow the instructions on your screen; for paid items you can select or edit your payment method with the down arrow and if it’s your first time making a purchase, the chosen method will be added to your account.
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