Once you have the activation code, visit Weathergroup.com/activate on your computer or phone browser. 8. This will direct you to the Weather Channel activation page. 9. Enter the activation code in the provided field and confirm it. 10. After that, follow the on-screen prompts to complete the activation process. Refer to the Roku site and perform further steps. 8.Finally, activate the channel using weathergroup.com/activate link.