Only the Primary Contact of the QuickBooks account can change the payment method in CAMPS. If you're the current primary contact or if the current primary contact is no longer associated with the company, I suggest contacting our Customer Support Team.
Our support can help update your billing information and the primary contact if necessary. Let me walk you through how:
Go to the Help menu of the company file, then select QuickBooks Desktop Help.
Hit the Contact us link.
Click Search for something else.
Enter Change payment method, then tap Search.
Click on Start a Message.
I've also attached some articles you can use as reference on how to use CAMPS, see your payment history and your products, as well as some tips to get familiar with the features available in QuickBooks: