To redeem a McAfee retail card or code on a PC, laptop, or mobile phone, first look for your 25-character activation code, which can be found on the retail card or in the email you received after purchasing an eCard. Open your browser on your PC or laptop and go to mcafee.com/activate web portal to redeem your product key or code. If you don't already have a McAfee account, you can establish one by providing your information; alternatively, sign in using your existing account. Once logged in, enter the activation code in the designated field and click "Activate." For mobile phones, you can visit the same activation portal mcafee.com/activate in a browser or use the McAfee mobile app, if available. Once the redemption of key is completed and activated, you will be prompted to download and install.