To activate your McAfee subscription, visit www.mcafee.com/activate and follow these steps. First, go to the website and log in with your McAfee account credentials. If you don't have an account, create one using your email. Once logged in, locate the "Activate" or "Redeem" option and enter your 25-character activation code found in your product packaging or email confirmation. After entering the code, click "Submit" to begin the activation process. Follow the on-screen instructions to complete the setup and ensure your McAfee subscription is active and protecting your device. For more details visit www.mcafee.com/activate.