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 format the confirmation email that the users receive by clicking on the Email tab in your Form Builder as you can see the following screenshot :
To do that, first of all, click on Emails and Autoresponder.
After that, you can update your email template when you're on Email tab.
Please find this user guide for more information related creating a custom autoresponder.
Please let me know if you require additional information or further clarification regarding this matter.