Joe Vallone Director of Sales

How do I update a previously signed document with a new signature.
The document has a DW signature applied on a Webform by an outside party and stored in the DW cabinet as a fillable Merge Form
The Merge Form is revised in the cabinet by a DW User.
I want to redistribute the Merge Form to the outside party and have it resigned.
Must I use Adobe Sign for this?  Other ideas.