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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Upon checking your email address email@example.com, I see that it is in the guest account. I would suggest signing up an account to us to better fully utilize the form builder
To change the background image, you can do that using the Form Designer Tool. In the "Background Image" section, you can change the page and form background. To remove it, just click the "x" button at the side.
I hope that helps.