To add a signature to a course certificate, you need to add the role Instructor to the user and then add the Instructor to the course. This is how you do it!
1. Add the role Instructor and add a signature
To be able to upload a signature, the User needs to be an Instructor. To do this:
Go to Studio > Users. In the User profile, add the role Instructor and click Save changes.
Refresh the browser window to view the upload signature field.
Upload a signature in png format. For best quality, make sure it's transparent.
1. Add the Instructor to the course
Open the course and click the tab Settings, add the Instructor to the course and click Save on the top right.
The signature will show on the certificate.