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.
I would suggest taking a look at this guide Matt: How to add Shipping to your Paypal standard account
Once you do, you will see how to set up your account to show you different price range options that you can utilize to properly set up your shipping.
An alternative - if this would not work for you, is to set up the Form Calculation to pass the value to the PayPal processing tool and then manually deduct the shipping / delivery fees before passing the value.
You can see more about this setup here: How to pass a calculation to a payment field
We are of course here if you have any questions or need any assistance along the way, so just let us know about it and we would be happy to help.