If you have been assigned a lesson on Arbor to cover, it will be visible on their dashboard under My Calendar.
To view all the lessons you have been asked to cover, go to My Items > My cover. Here, teachers can also view who has covered their lessons.
The lessons staff members have also been assigned to will also show up on a staff members calendar. Go to My items > My Calendar.
Clicking on the lesson from their calendar will allow them to access the registers for the lessons to complete them on Arbor. You can see more information about how the calendar works here.