Follow the below guide if you want to extend the subscription to your McAfee plan.Launch the McAfee product by double-clicking on its icon on the desktop. Next, you need to click on the Your Subscription option. After that, choose to Buy a Subscription. And then select the option Buy. Afterward, you are required to enter the billing information and select your preferred payment method. Later, you just go along the instructions on the screen to complete the process. You will be able to check the subscription information and upgrade details by going to My Account.