Changing the Billing Information in the new Rakuten TV app is very easy
1. With the red button of your remote control go to Menu.
2. Go to Settings.
3. Pair your account (in case it is not paired yet).
4. Click on Update payment details.
5. Enter your Credit Card number and click Next.
6. Enter the expiration date and click Next.
7. Enter the 3 digits of the CVV and click Next.
8. In order to confirm the information click on Press OK to continue.