When you're ready for students to view the reading list, click My list is ready at the the top of the screen. This will "send" the list to the library to review (if there are incomplete citations on the list that copyright review or physical fulfillment) and will also publisht the list to students if you check the box. If you you want to keep your list private to your class (and require that students access through Canvas) you can publish only to course students. If you publish to all students at the institution, that means the list will be findable in the search and that others can see the online citations you've added, but any files you uploaded will only be accessible to students in your course that access the list through Canvas.
