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I assume that you are referring to this form: https://www.jotform.com/61164724301143
I see that you have products there created through payment wizard.
To change the items price please follow:
1. Go to your form builder,
2. Find payment field on your form and click on wizard button:
3. Then click continue:
4. Click on each item that you want to change price and you will be able to change below
Please let me know if this helps or if you had something else in mind.
Got it. Thank you!