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 can change your Thank you message manually. This guide will give you the information on how to do it: https://www.jotform.com/help/211-Setting-Up-the-Thank-You-Page
With regard to the email subject, you can also change the information in any part of your email alert. You can refer to this user guide to learn more about email alerts: https://www.jotform.com/help/30-Explanation-of-Email-Notification-and-Autoresponder-Settings
If you have further questions, please let us know.