To reactivate or activate your McAfee/Activate product key, first confirm that you have your product key, which is usually found on a card or sent to you after purchase. Users can activate it through the website Mcafee.com/activate or using the App Start by launching any McAfee application on your computer, such as McAfee Total Protection. If you are currently logged in, please sign out first. Then, go to the mcafee.com/activate and log in using your registered email and password. Once logged in, navigate to the "My Account" section, where you will see an option to enter your activation code or product key. If you can't find it, look for the "Activate a new product" option. Enter your 25-character product key and follow the prompts to finish the activation. Also, if you're reinstalling the program