To redeem a Netflix gift card, you need to access your Netflix account. You can redeem the gift card by following these steps:
Go to netflix.com/redeem.
Find the code via email or scratching the back of a physical card.
Enter your code or PIN.
Click on Redeem to redeem the gift card.
Enter the email address that is linked to your account or create a new account.
You can either start watching or start a membership.
If you have already attempted to redeem your gift card and it did not work, you can try clearing the Netflix cookie by going to netflix.com/clearcookies and then attempting to redeem your gift card again.