how to delete one Apple ID from my ipad
I have iPad 4 with iOS 6.0.3 and I purchased it from a friend who I have no contact with now. His apple id comes up when I try to upgrade to iOS 7 and I do not have his password. I have my own ID therefore can I upgrade via this and, if so, how?
I would however still like to delete his ID from the iPad.
iPhone 4, iOS 6.0.1