How legal can I hold someone who signs an online form?

How can I hold someone legally to an online signature?

E-signatures are legally binding on almost all countries and states, but we still recommend consulting with your lawyer. JotForm records the IP address and time of the signature made so that also provides additional confirmation about the signer of the document.

The excerpt above was taken from the detailed guide I'm linking below.

Complete guide: How-to-Add-an-E-Signature-to-Your-Form