What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
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Is this what you are refferring to?
If it is, You have to upload the image first to a web/internet location, then paste the URL into the button image field.
You can use our image upload feature, which will provide the URL when the Image is uploaded that you can use for your button:
Not sure if I responded to your question - but please let us know if this helps.