Select "Report Card" on the left side of the screen. You'll then see a drop down menu and you can choose to view grades for a single student or view grades for the entire class.
When you select to view a single student by clicking "student", then you'll need to select which student in the drop down menu on the top left.
After you select the student, then you can look at their grades, comments that were made, citizenship, attendance, skill, and their progress reports for each quarter.
When viewing the report cards by class, you'll be able to see the same information you saw when viewing "student", but now all the students in your class are viewable at a glance.