Once you’ve downloaded the app:
Tap the icon to launch the app.Access the section of the app that offers subscription-based content to purchase.On the confirmation screen, choose an existing payment method or add a new payment method.Confirm the purchase by selecting “Accept & subscribe.” Note that exact pricing on the "Accept & subscribe" screen may vary slightly from the price listed on Google Play based on currency exchange rates and that pricing may change from month to month or year to year.If you have a PIN code enabled for purchasing, you’ll need to enter the PIN code after selecting “Accept & subscribe” on the last screen.