Activating YouTube on your device using yt.be/activate is simple. First, ensure your device is connected to the internet. Open the YouTube app on your smart TV, gaming console, or streaming device. You'll see a prompt to sign in. Follow the instructions until a code appears on your screen. On your computer or mobile device, open a web browser and visit yt.be/activate. Sign in to your Google account if prompted. Enter the activation code displayed on your device, then click "Next" or "Activate." Your device will link to your YouTube account, and you'll be ready to enjoy your videos.