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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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Undo deleteAsked by aomack on July 14, 2016 at 10:22 AM
If you're referring to restore a deleted form, then this guide will help you with that: How-to-Restore-Deleted-Forms
If this is about restore a deleted field while in the Form Builder, then you should click on the back arrow shown in the Form Builder and this will bring back the field:
But if you have deleted the form and closed your session, then will not be possible to restore the field by following this method, you will need to do it by checking the form changes history, this way you will get all the changes that you've made on your form and you will be able to revert your form back to that version where the field was there.
Here is a guide that will help you with that: How-to-view-form-revision-history
Hope this helps.