To activate McAfee on your device, start by visiting mcafee.com/activate First, sign in to your McAfee account or create a new one if you don’t have one yet. Enter the 25-digit activation code provided with your purchase. After entering the code, follow the on-screen instructions to download and install the McAfee software on your device. Once installed, the software will automatically activate, and your device will be protected. If you encounter any issues during the process, ensure that your code is correct and your internet connection is stable.