Install SigningHub for SharePoint from SharePoint store
Browse your on-premises SharePoint Admin URL.
Click the "Apps" option from the left panel, and then click the "Manage App Catalog" option.
Click the "View Site Settings" option from the next appearing screen.
The "Site Settings" screen will appear, click the "Site Contents" option.
Click the "add an app" option.
Click the "SharePoint Store" option from the left panel.
In the next appearing screen, search "SigningHub".
The SigningHub add-in will be retrieved. Click it to install.
From the next appearing screen, click the "ADD IT" button.
In case SigningHub for SharePoint is already installed on your site, and its new version is available for installation then the "UPDATE IT" button will be shown on screen.
A confirmation dialog will appear, click the "Trust it" button.
SigningHub for SharePoint will be installed in your SharePoint account and displayed on the Site Contents screen.
1. The operator installing the SigningHub for SharePoint add-in, should have the SharePoint Admin rights (i.e. Tenant Administrator) on the site collection where the add-in is being installed.
2. Once the above installation is done, proceed to configure your SigningHub Account Settings,see details.