Submission and Review Forms are made up of a number of questions that can be reordered on the page
Start off by going to the Form Editor for the form you want by following the instructions here: Editing Forms
Once on the Form, go to the page you wish to edit by clicking on the relevant Page button at the bottom of the screen. Then click and drag the question you want to move to its new position in the page.
NOTE: This changes the order of questions on the form only and not on the submission and review pages. Please contact us at email@example.com if you need fields to be reordered elsewhere.