To view the "Grades" page, just click Go To -> Grades.
Here, you'll see a list of your students. Click a student's name to view the grades page for that student. You'll see all teachers connected to that student, along with all classes the student is currently assigned to.
Clicking on a teacher's name in the list will allow an admin to view all classes that the selected student is attached to, with all assignments/assessments/standards that have been created.
Clicking on a specific class under a teacher's name will display all assignments/assessments/standards under that specific class for the selected student.
To print/download performance reports, click on the "Performance Reports" button at the top of the "Grades" page.
Here, admins can select to create reports for specific students. When the information you wish to include on the report is selected, click the printer icon.