Need to add payment method

It says I already have a payment method and won't let me change it. I need help on where to find it. I prefer to use Paypal. 

Hi,

You can only add one payment method on a form.

To remove or change the current one you have, first you need to delete the existing one, after that a message will pop-up showing if you would like keep the products, you can then add the Paypal integration to your form after that. Here's a screencast on how to do it:

You can also refer to the following guides to help you setup your order form:

http://www.jotform.com/help/165-Setting-Up-Your-First-Order-Form 

http://www.jotform.com/help/323-Mastering-Payment-Form-Integrations-with-JotForm 

If you are setting up multiple payment methods, you can follow this guide: http://www.jotform.com/help/182-How-to-Create-a-Basic-Multiple-Payment-form 

I hope that helps.