What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I see you are paying your subscription through PayPal, so if you want to change your Credit Card, you should do it on PayPal, also if you want to change your Payment method and pay with your Credit Card directly rather than with your PayPal account, you can follow this guide : http://www.jotform.com/help/330-How-to-update-my-subscription-s-payment-method
Hope this will help you.