Buying apps from the App Store on an iPod touch requires an Apple ID and a valid payment method. Once you have these, you can follow these steps to buy an app:
- Open the App Store app and browse for the app you want to buy.
- Tap the price button for the app.
- If you’re not signed in to your Apple ID, you’ll be prompted to do so.
- Enter your Apple ID password and tap Sign In.
- If you’re using a payment method other than your Apple ID balance, you’ll be prompted to enter your payment information.
- Tap Buy to purchase the app.
Once you’ve purchased an app, it will be downloaded and installed on your iPod touch. You can find your purchased apps in the Purchased tab of the App Store app.