To redeem an iTunes gift card, follow these steps:  

On iPhone, iPad, or iPod Touch:  

1.Open the App Store:  

•Tap on your profile picture in the upper-right corner.  

2.Tap “Redeem Gift Card or Code”:  

•You might need to sign in with your Apple ID.  

3.Use Your Camera or Enter the Code Manually:  

•Hold the card in front of your device’s camera to scan the code.  

•Alternatively, enter the code manually by tapping “You can also enter your code manually”.  

4.Tap Redeem:  

•The balance will be added to your Apple ID account.  

On a Mac:  

1.Open the App Store:  

•Sign in with your Apple ID if prompted.  

2.Click Your Name or Profile:  

•Located at the bottom of the sidebar.  

3.Select “Redeem Gift Card”:  

•Enter the code manually or use your Mac’s camera to scan the card.  

4.Click Redeem.  

On a Windows PC:  

1.Open iTunes:  

•Download and install iTunes from Apple’s website if you don’t have it.  

2.Go to “Account” > “Redeem”:  

•Log in with your Apple ID.  

3.Enter the Gift Card Code:  

•Click Redeem to add the balance to your account.  

Online:  

1.Visit the Apple Gift Card Redemption page: Redeem Page.  

2.Sign in with your Apple ID.  

3.Enter the code on your gift card.  

4.Click Redeem.  

Where You Can Use the Balance:  

•App Store, iTunes Store, Apple Music, iCloud subscriptions, and more.  

Let me know if you need help with any of these steps!