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.
You have to upload the images to any image sharing sites and use the direct link in the Image Slider Widget. It's not working to your form because you're missing the correct URL.
This URL is incorrect: http://images/4_slideshow.png?1. The first image link is correct: