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Do you mean to say that you want to create a workflow based form where form can be submitted by user and then it is sent to some other user or admin to approve it by adding signature?
Though there is no built in feature to achieve this but with a little workaround it is possible to achieve your requirement. You may like to take a look at the following thread where I have explained this step by step: https://www.jotform.com/answers/401633
Hope this helps.
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