https://www.tivo.com/activate/stream4k/ : How do I Activate My TiVo Stream 4K?
To activate your TiVo Stream 4K
2. Once you get to the activation screen, take note of the activation code.
3. From a computer, laptop or your mobile phone, go totivo.com/activate/stream4k.
4. On the Activate Your Stream 4K screen on your browser:
5. Next, you will be asked to log in using your TiVo account. If you do not have an account, choose Create Account to proceed.
6. After activation, you will have the option to link your Sling account or start a free trial.
7. After activating your device, proceed to go back to the TiVo Stream 4K and continue with Personalizing to complete the set up.