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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I am not sure if I have understood your question correctly. Do you mean to say that you have embedded your form in Facebook tab and you now want to remove it?
Here are the steps to remove facebook tab:
#1. Go to facebook app page.
#2. Click on the "Settings" tab.
#3. Click on "Apps" link form left menus.
#4. Click on "x" button of JotForm app and also confirm by clicking the "Remove" button. Please check the screenshot below:
Hope this helps.
Do get back to us if you meant to ask something else.