How can I e-sign a form I received via e-mail?

How can I e-sign a form I received via e-mail? It's not a pdf. It has a "Submit" button to send back.

Hi Dashiell! We have various e-sign widgets that form owners can use. But these are only available if the form owner has implemented this in their form. If you're not seeing it, then it means that the form doesn't have any e-sign widget on their form.

Thank you!