are you able to insert a signature field on a form so someone can sign off on the form?

To insert signature in the form  you can use our Adobe Document Cloud eSign Widget accessible at at https://widgets.jotform.com/widget/adobe_dc_esign_services

Here is a complete article on how to integrate the widget on the form : https://www.jotform.com/blog/148-Announcing-the-Adobe-Document-Cloud-eSign-Widget

Let us know if you have more questions about the same.