Welcome to our forums, @christibea.
I want to make sure you'll be routed to the right support that will help you modify in changing the info on your account. They use specific tools to pull up your account in a private place and help you update the owner's info.
I recommend contacting our QuickBooks Merchant Services Department. They have the necessary tools to help you change credit card processing method.
Here's how you can reach them: QuickBooks Merchant Team.
Also, I'd like to share this article with you to learn more about the fees and rates for credit card processing: Understand credit card processing rates and fees.
If there's anything else I can help you about managing users in QuickBooks, just let me know. I'd be more than happy to assist you further.