How do I connect our PayPal on the donations page in Diplomat?

I purchased Diplomat. For some reason my purchase code will not work so I can register and send a support ticket. theme forest has no other way for me to contact them on their webpage. I need to know what is needed in order to connect the PayPal button to our team PayPal. I have the old coding, but when I insert that I lose all of the functions of the page which allow the form submission and the chosen dollar amounts to be sent to PayPal. I’d like to retain those if possible. TIA