Have you set up an account on the My5 website? You will need one.
Once set up, open the My5 app on your box, sign in and you should get a code to input on the website.Enter
Enter this code and your account should sync.
Please remember to mark Solved Posts with Best Answer. Doing so helps other customers and saves TalkTalk's Support Team time by only looking at unsolved topics. Thanks, Steve (a fellow customer).
