Hello @dwbranton Thank You for posting your question. All the Attendance (Roll Call) Guides can be found via this link. You can find these Guides by clicking on the "Guides" menu at the top of any page here in the Community and then selecting "Canvas LMS". Then, click on the large red "INSTRUCTOR GUIDE" icon.
I hope this will help, Diana. Please let us know if you have any other questions about this...thanks!