JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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.
I did check your form and found that it does have next button / page break field. Please check the screenshot below:
I am not sure what problem you are having. If you have accidentally deleted the page break field, you can add it again. You may like to take a look at the following guide on how to create multi-page form: https://www.jotform.com/help/119-How-to-Create-Multi-Page-Forms
Hope this helps.
Do get back to us if you have any questions.