What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
From your question I understood that you want to add shipping fees on your Paypal account so that it will include the fee whenever the buyer purchases via Paypal through your form here in JotForm.
If that is the case, you can look following guide and find out how to set shipping to your Paypal standard account:
Hope this will help. Let us know if you need further assistance.