How do I delete my credit card from Rover account (should not be kept in storage without my permission)?

Make sure to go into your account dashboard, click on HELP, click on OWNERS and read the Terms of Service. At 2.5 "Bookings", navigate to the bottom (After you have read the Terms & Services) and click on the link given at the bottom of the 2.5 paragraph. That will take you to How do I book with a sitter or dog walker? Go down to the bottom of the page and click on Payments section. That will provide you with all the information on security and how to delete a credit card or add another. I could have taken you directly to this section but feel you should really read the Terms and Services to be informed.