Advertisements I looked around Amazon but couldn't find my problem listed. So I set up my Amazon account to utilize Unbox for rental. The problem is no matter how I choose to rent, either through the Tivo or online, the rental always generates an error... that being no credit card is connected to the unbox rental account. This isn't so. I've set it up several times yet every time I rent I have to manually choose which credit card to use. It's very annoying. How can I lock a credit card to unbox so I don't have to go online every time I want to rent something and choose the card to use?