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Were you having issue using the Form Builder?
I presume this is your Order Form http://www.jotformpro.com/form/51946194055965, but can you provide us more details on what the issue is?
I made a test, and I can easily modify the form in my Form Builder.
You can also try to restart the browser and login back to JotForm and retry again.
Hope this help. Please let us know if issue persist.