After you redeem the card, you can download and install your McAfee software and activate your subscription.
1. Open a web browser and go to the link shown on your retail card (for example mcafee.com/activate).
2. Select your country and language. ...
3. Type: ...
4. Click Submit.
5. When prompted, check that your Email Address is correct. Know more
For more information: Mcafee Customer Service Number | Mcafee Customer Support Number