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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I presume that you do not want to see the thank you page, but instead to show the same form once again?
If that is true, then please take a look at the following guide that will show you how to do this: Redirecting Users to a Different Page
In the redirect URL, all you should do is to add the link to your jotform and that will result it to submit the data and show itself once again - without any data entered in it.
Do let us know if this is what you were after.