Teachers have indirect access to PowerSchool through their work on PowerGrade, but they can also directly log in to the system. Teachers can view some of the same pages as school administrators and do some of their most important record keeping directly in the PowerSchool system.
PowerSchool Administrator Login
How do I use PowerTeacher? View this quickstart screencast:
http://www.screencast.com/t/aX9ioXBqoOS
PowerTeacher User Guide