You can print the index of a class or group in the following way. 

In the main page of the Attendance choose the List option in the left side of the page.

In the appearing window, the name of the scene, the code of the class, and the name of the attendance time will be visible, as well as the list of names of participants of the attendance time. 

By default, the index contains the photos of students, which you can remove by clicking on 'Simplified view'. 

If the list is too long, you can use the 'Two column view' for saving space. 

If you are ready, click 'Print'.