How to redeem Xbox gift card from browser;

From a web browser, go to redeem.microsoft.com

Enter the 25-character code, select Next, and then follow the prompts.

How to redeem Xbox gift card from console;

Press the Xbox button to open the guide, and then select Store.

Press the View button to open the side menu, and then select Redeem.

Enter the 25-character code, select Next, and then follow the prompts.