To edit a form go to the DataForms Control panel. Data Forms Control panel by clicking on the 1 data form button. (The number on the button might vary depending on the number of forms attached to the page.)
Click on the first document Edit button next to the name of the form you want to edit. When hovering over the button a tooltip with the word Edit will appear.
Edit the form as you see fit and click on Save to save the changes.
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