How to change from one payment processor in a form to another

I started with an existing form and made changes to it. It has authorize.net as the payment method and I can't find a way to change it to PayPal. I tried cloning it, but couldn't get that work either.

To change the payment processor in your form, delete the payment field and add the new one.  All products/subscriptions will be saved when you delete the Authorize.net field and will be inserted automatically when you add the PayPal field.