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 presume that you are asking if you can upgrade your account by using credit card, in which case, the answer is yes, yes you can.
To do that, all that you should do is to go to our pricing page: https://www.jotform.com/pricing and once there, you can select the plan that you wish to upgrade to and selecting the credit card option on the right (it should be selected by default):
Do of course let us know if you happen to have any issues or questions and we would be happy to assist with the same.