I have not credit card .i have debit card but when I try to make my I'd then it show wrong pasword
I buy it 2ndhand
iPhone 4, iOS 6.0.1
Do you mean a message about the card's security code ? If you do then debit cards aren't accepted in all countries - there is some troubleshooting for security code error messages on this page : http://support.apple.com/kb/TS1646
There are also instructions on this page for how to create a new account (the instructions won't work with existing account) without giving card details which would allow you to download free items : http://support.apple.com/kb/HT2534