eSignAnyWhere is an integration between Word and an electronic signature provider Namirial. In order to use the add-in users must have a valid Namirial account and enter its API credentials on the Welcome page. That page is accessible from the add-in page and should be used by the Office365 administrators. Only enabled users by the administrator can use the add-in.
The add-in takes the content of the currently edited document and sends it for electronic signing to the list of recipients specified.