IOs 6 update? How can I delete music using my iPod touch?

2 weeks ago, I was going to buy some music on my iPod and I can't even tap on the price to get the screen where you enter your password. So then I got my laptop and tried it on there, but it said my payment information is invalid. And so then I also tried to delete music music using the swipe method and it didn't work. So then I tried it on my laptop again and I deleted music out of my library but the music I wanted to delete was still there. And so I tried what it felt like a million times and then I got angry and gave up. So I'm still just using the pandora radio app. HELP ME. :(

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