This documentation shows how to export file for unregistered clickers. The exported file is useful to show students which clickers have been participating, but have yet to be registered to a student.
Click on the Unregistered Students & Remotes icon, the little man with the red shirt image, above the student data.
Within the Unregistered i>clickers tab click the Export to CSV button.
A pop-up will appear asking where you would like to Save your file. Define a location and your file will be exported.