Paypal form not working

Hello is there a way to keep this form where it automatically adds up product purchase pricing and allow us to submit form. Client is running into an error when filling it out. Is there something I'm supposed to do on my end?

Form name: Clone Of Simple Product Purchase Form

Can you try to fill out and see if you can fix this form for me please?

Thank you

As checked, you haven't added your PayPal email here, thus the error:

Please add it to this field and click CONTINUE to save the changes. That should resolve the issue.