In the Grading window, click the 'Grade Now' button  

Next, you will access a screen where you can see all your student's submissions (centre), feedback received and provided (left pane), and your grades for this student (right pane).  To Navigate between Peer's use the navigation options (Top Centre)

Areas Highlighted in this Image.

  1. Submission view pane
  2. Feedback received and provided pane
  3. Grade pane
  4. Toggle between Feedback Given and received 
  5. Options to navigate between Students

To toggle between feedback received and given, click in 'View Received Feedback' and 'View Given Feedback' in the top left corner of the screen.