1. Browse the SharePoint site link (as provided by your SharePoint admin) and log into your SharePoint account.

2. Click the "SigningHub" option from the left panel.

3. Click the "SigningHub Users Access" option from the next appearing screen.

4. The "SigningHub Users Access" screen will appear, listing all your SharePoint users along with their respective information, exp: Full Name, Username, (Work) Email and SigningHub Status. These users are managed (added/ edited/ deleted) by your SharePoint admin. 

5.a. To block, select an (activated) user from the list and click the "Block User" button, as marked with an arrow on the image below. The selected user will be marked as "Blocked" in the list, after confirmation. They will not be able to use the SigningHub services from SharePoint.

5.b. To unblock a user, select them from the users list and click the "Unblock User" button. This will reinstate the user access in the SigningHub for SharePoint add-in.