How to create a form where client can drop pins on map

How to create a form where client can drop pins on map As a geofence around his property 

Hello,

You can try using an Address Map locator widget on your form - https://www.jotform.com/widgets/address-map-locator 

You may add this widget to your form so that the user can select the location on the form. 

Hope this information helps.