How can I restore a previous version of my form ?

I had a friend of mine help me design a form, he has since left the country and I worked on my own form but have made a mistake and now it does not work like before. How do I restore a previous version of my form?

Please check this guide on how to restore your form's revisions https://www.jotform.com/help/294-How-to-View-Form-Revision-History

Let us know if you need more help.