Click on Class Sheet at the top of the page.
Select the class the student is in, from the drop-down menu.
Click on the student's name.
In the pop-up window, make the necessary changes to the student's name.
Click Save.
You may need to refresh the window, in order to see the changes.
Note: From that same pop-up window, you can edit the student's class, grade, and team. You can also delete the student from the class.