Can't use i-tunes gift card without asking for bank details
I have just bought an I-tunes gift card for my son and redeemed it-the money is showing on my account. But, when I try and buy music to download, it asks for my bank details. I want to use the money credit from the gift card....not money from my bank account. Now it is asking security questions which I can't remember the answers to. How can I use the money from the gift card???
iPod touch (4th generation)