How do I change my credit card information?

As a sitter, I don't see what customers fill in, but I assume you have saved your credit card information. The next time you book a service, usually the payment information will pop up and you should be able to change it at that time. I don't believe there is anywhere in your Profile where you can do it.

However, you may want to give Rover Customer Support a call at [Edit: Rover’s contact options have changed. Visit the Rover Help Center at https://support.rover.com/ to find the phone number, help articles, or chat with the team] to verify that you will be able to change the credit card info the next time you book a service here.