Check your settings:
Stream - do you want students to post? comment?
Turn on Import for Importing Grades to Skyward
OVERALL Settings:
Notifications? When do you want notifications?
Organize and Provide Structure for your Classroom
Use Topics
Make a "Right Now" section to place announcements and assignments that you want students to work on during that class period.
Teach Students to Use Their "To Do" Feature
Teachers - Use Your "To Review" Feature
ARCHIVE Any Classes you are not actively using
Students can no longer unenroll from Classrooms