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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.
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I highly recommend creating first an account also before enything else.
You can use this link http://www.jotform.com/signup to signup using your email account.
Having an account will help you get oriented on JotForm on the start.
As for the Payment gateway you are looking for, the Payment Integration used on the form you mentioned http://www.jotform.us/form/52438211140139 was Paypal.
You can check for all the Payment integration available to JotForm here
Let us know how we can be of further assistance.
I need your more guidence please. I can help you with good amount. Please