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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Here are the answers you are looking for:
1. Remove dropbox account- Here are the steps to remove the dropbox integration with your for:
a. Load your form in editor.
b. Click on "Integrations" on your form toolbar.
c. In the integration wizard window, click on the Dropbox icon (if already connected, it should display "Connected to Dropbox")
d. Clicking on dropbox will open a dropbox integration wizard. You should click on "Remove Integration".
As we can't answer multiple question on single thread, please start separate thread for your other two questions.