Is credit card the only form of payment accepted?

If you're referring to the subscription payment method, you can use Credit Card, PayPal, or Purchase Order/Check. 

Here are some helpful guides:

https://www.jotform.com/help/331-How-to-Upgrade-My-Account

https://www.jotform.com/help/353-How-to-Upgrade-and-Pay-by-Purchase-Order

Let us know if you're referring to a different issue. Thank you.

It is not giving me the option to change my payment method.  It only allows me to change the credit card number.  Do I have to cancel current account in order to change payment method of our account?  

Hi, 

May I know what payment method are you going to use? You can also follow the guide below if you want to change your Payment Method.

https://www.jotform.com/help/330-How-to-change-my-Payment-Method

We'll wait for your reply.