PowerTeacher Pro (Gradebook) can be accessed by clicking on the PowerTeacher Pro link below each Class name.
By default, you will be brought to the Assignments page for the class you selected within PS SIS. From this page you can navigate through various functions through the menu on the left side of the screen, use the dropdown at the top to navigate to different classes, use the + to create new assignments, or click on your initials to sign out.