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.
Please see this guide: http://www.jotform.com/help/194-How-to-Assign-a-Status-to-Submissions
This can help you to accomplish what you need, you will be able to mark submissions as Approved or Disapproved using Hidden Box tool. This is somewhat like an Admin Approval System.
Let us know if you need more assistance, we will be glad to help you.