Apple ID has not yet been used in the iTunes Store
I'm trying to download an app for the first time on my iPad. I get an error message saying This Apple ID ha not yet been used in the iTunes Store. Tap Review to sign in, then review your account information. When I click on Review I get a pop up saying Sign In Required. Enter your Apple ID and password to create an iTunes Store account from your existing Apple ID. I do not have an option of entering my Apple ID it only allows a box to enter my Password. I enter my password and it brings up the box again that This Apple ID has not yet been used in the iTunes store. Please help.
Thank You.