If you have chosen auto-renewal mode then your McAfee will renew itself and the payment will be deducted from your credit card. The auto-renewal will take place a month before expiration and subscription will be extended for a year. But if you have disabled the McAfee auto-renewal; you will receive a reminder a month before actual expiration. Go to the McAfee dashboard and click on My Account. Log-in to your McAfee account and click on subscription. Tap the renew McAfee with Activation code button. A window will appear and choose the appropriate subscription plan. Hit the renew button and provide the billing details. Now check whether your subscription is expanded on not.

https://mcafee.activateyourproductskey.com/