If you discover that you have asked iTunes to stop showing a warning message that you realize you do want to see after all, you can reset the warnings. There is no way to reset them individually; you must reset them all at once. To do so, follow these steps:
- Open iTunes.
- Choose Store > Sign In.
- Enter your iTunes Store account name and password and click Sign In.
- Choose Store > View My Account.
- Click the Reset button.
- Click Done.