Q: How do I remove a credit card on my iTunes account of it doesn't give me the none option

Here are the steps for changing your payment method for itunes

Visit the link below, or follow the instructions I pasted for you.

Change or remove your Apple ID payment information - Apple Support

Please visit this link to show reasons as to why you are not able to select "None"

Why can’t I select None when I edit my Apple ID payment information? - Apple Support

Use your iPhone, iPad, or iPod touch

1. On the Home screen, tap Settings.
2. Tap iTunes & App Store.
3. Tap your Apple ID.
4. Tap View Apple ID. You might need to sign in.
   
5. Tap Payment Information. If you're using Family Sharing, you might not see Payment Information. Only your family organizer can update your family’s payment information. Learn more about payment information and Family Sharing.
6. Change or remove your information. To remove your payment method, select None. Learn what to do if you don't see None or can't select it.
   
7. Tap Done.