Sign in without credit card if the Apple id is already created

I have create my apple Id online using chrome and not from the App store or Itunes. Now when i try to download any free app from the app store it gives me a error that the Apple id i am using has never been used before. It takes me to a different page where i have to agree to the agreement and demands the credit card info on the next screen where the "none" option is not available.