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.
You may change the error message from the Form Preferences > Advanced Settings > Edit Form Warnings. Please see the screencast below that can help you with changing the error message on your form.
Hope this information helps!