Say you have an old group of students that are graduating and you want to use their seats for a new group of students. This is how to do it:
Start by importing all the NEW students to your User list. Click the "Import Users" button and choose which way you want to import them. If you're unsure, check out this article on Import Users.
Your new students will appear in the "User List" with all of your old students.
(1.) Select the students you wish to unassign a seat and choose "Edit Seat" --> "Unassign seats" in the purple menu that appears above.
(2.) A warning symbol appears next to students who don't have seats.
(3.) To assign seats for your new students, simply select them in the list by checking the box next to their name and choose "Edit Seat" --> "Assign seats"
Note that you can undo and redo these actions any number of times!
(1.) EDU admin panel - User list - Unassign
(2.) Users without seats warning symbol
(3) Edit Seat - User List - Assign seats