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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First, you have to find a free image hosting sites like http://www.imagetitan.com or http://postimage.org and upload your images there. Get the image direct URL e.g. http://www.site.com/sampleImg.png. Then paste the image URLs on the Image Slider Widget configuration box separated with a new line.
If you have further questions, let us know.