Hey @mstudioil ,
This feature is not available in Metform free version. We have a Signature Widget (screenshot) in our Pro version which might help you to solve your problem.
To see live demo you can visit this link and navigate to all form controls tab (screenshot) and scroll below the page to see it in action.
If you have further queries you can contact our support center and they will help you with all your queries you have.
Regards
