ITUNES APP STORE WITHOUT A CREDIT CARD WITH EXISTING APPLE ID
I've been trying to create a free itunes app store account. First I read the instructions in this link : http://support.apple.com/kb/ht2534, but the link shows how to create a new account, the problem is that I already have a Apple ID.
On the other hand when I try to sign in in the app store with my existing Apple ID, I get the message "This Apple ID has not yet been used with the iTunes Store please review your account information" with two options "cancel" and "review".
Clicking in review, I go to the page with the terms of service, continuing I go to a page where I have to type my email, my password, question and answer for the password and my birth date. The email field has the email that is being used with my current Apple ID, and the password field has the password of my existing Apple ID. The other fields are blank. Completing them, and clicking in next I go to the payment options page, but there's no "none" option, so I can't make a account withou using a credit card.
Is there a way to create a itunes app store without a credit card with my existing apple ID, or a I have to create a new one ?
Powerbook G4 15' 1.33 GHz, Mac OS X (10.5.8)