How can I refund someone's credit card?

If a credit card is incorrectly charged, how do we go about putting the funds back on that person's credit card?

This is something that you need to do using the payment processor system, if you're referring to this form: http://www.jotform.us/form/41697894856175 then you would need to do this using your Authorize.net account.

You can read more about this process here: https://www.authorize.net/support/CP/helpfiles/Search/Transaction_Detail/Refund_a_Transaction.htm

I hope this answers your question.
Thanks.