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.
Unfortunately, I wasn't able to replicate the issue. I was able to change the Form Warnings in Form Builder V4. Here's a screenshot:
After changing the Form Warnings, please don't forget to click the "Save Changes" button at the bottom part of the wizard.
It is also possible that your session timed out wherein you need to log in again to your JotForm account.
Let me clear your form cache so that your forms will be refreshed from our servers. If you're still experiencing this problem, please try to use another browser just to check if it will work or not. You may also need to clear your browser cache.
Hope that helps. Thank you.