First on a computer try editing your ID to change the payment method to None.
How do I change my Apple ID Name or personal information?
You can change your Apple ID Name at My Apple ID. Click on Manage your Apple ID and sign in with your Apple ID name and password. Click Edit and enter the new information, then click Save Changes. Changes take effect immediately. You can also use My Apple ID to change your personal information, such as your mailing address or email address. See Changing the name you use for your Apple ID if you'd like more information.
If problems see:
Why can’t I select None when I edit my payment information?
Last:
Create aNEW account using these instructions. You have to use an email address not used with Apple before.
Create a NEW account using these instructions. Make sure you follow the instructions. Many do not and if you do not you will not get the None option. You must use an email address that you have not used with Apple before.
Creating an iTunes Store, App Store, iBookstore, and Mac App Store account without a credit card