Open the Teacher Dashboard (edu.flashacademy.com) and log in.
Select User Admin and choose the Students option.
Hover over Bulk update and select Remove Students, then choose the students you wish to remove by deselecting the green-plus next to their name.
You can make this easier by using the Class filter to see a specific group or by using Search to find a specific student.
Once all students that you wish to remove are displayed in the box on the right, click Next.
You can also remove students one-by-one by selecting View Profile next to the student's name, then click Remove.
It will ask you to confirm this. It will take a moment to load, and your pupils will be removed.