Add a signature manager.
You may designate additional users to manage signature settings. Signature managers can modify all signature settings, upload images, and configure signature managers themselves, but will not have access to any other parts of the dashboard (unless they have been assigned other administrator roles).
 Instructions
Navigate to Email Signatures - INKY
Scroll to the bottom of the page to the section called Signature Manages
Select Edit Signature Managers
Specify Email addresses directly or Groups if the Domain and Directory access API is granted.
Select Save.