i dont get none option...as i dont use credit card

Did you follow the instructions inCreate an iTunes Store, App Store, or iBooks Store account without a credit card or other payment method - Apple Suppor… completely? You should see the option to use no payment method.

You don't have to have a credit card but it is normally used at some point to validate your address so that, for example, you don't try to access the store of a different country.

There are some hoops you can jump through as you create your iTunes account that workaround the need for a card (given in the link above) otherwise once the account is set up iTunes may still expect you to provide one, which you can subsequently remove. If you don't have or want to use a credit card at this time you can try this method...

1. Enable the menu bar if needed with Ctrl+B (Applies to Windows only)
2. Sign out of the iTunes Store from the Store item on the menu bar
3. Go to iTunes Store home page
4. Go to Quick Links > Redeem
5. Sign in with your Apple ID
6. Go through the screens, accepting the EULA, etc. You should arrive at a Review Payment screen where one of the options is None - select this and continue. You shouldn't actually need to redeem a new voucher/card.

tt2