Store cards tend to have the highest interest rates.If you don't pay off the full amount owing each month, you need to know exactly what interest rate you're paying.
The way to avoid this step is to get through to this dialogue box from a different location.
Instead of clicking 'sign up' from the top bar, go into the i Tunes store (not signed into any i Tunes account) and find a free app.
If you click on this app to 'buy' it, you'll be taken to the login/sign up box again.
If you input your details in this one, however, the credit card page will give you a 'none' option for payments.
It's easy to think that your debt is too big to deal with.