Download and Activate on Xbox Live:
Redeem prepaid codes on your console
Sign in to Xbox Live using the account for which you want to use the prepaid code.
1. Scroll right to "Games".
2. Select the "Use a Code"
3. Select "Or enter the 25-character code”
4. Enter the 25-character prepaid code and select Enter.
5. Click "Confirm "
Redeem prepaid codes on a computer
You can redeem all types of prepaid codes on a computer, including Xbox gift cards, Xbox Live gold cards, and Xbox Music Pass cards, and have them applied to your account immediately.
1. On a computer, go to Redeem Code and sign in with your Microsoft account.
2. Enter the 25-character prepaid code and click Redeem Code.