To get the Piggy Bank's resources:
- Tap on the Piggy icon on the home screen.
- Select purchase.
- Complete the purchase in the App Store or Play Store, once the game redirects you there.
Note that the Piggy Bank will have a fixed price in real money, and you will be able to purchase the accumulated prize whenever you wish to. However, remember that the more crowns you manage to compute in the game, the more items you will be able to add to your Piggy Bank. This will make it more convenient to buy.
We invite you to visit the article: What is and how does the Piggy Bank work? so you can learn more about this feature.