To view feedback there are 2 options.
Viewing the feedback a submission has received:
Go to the results tab in the assignment. The page automatically opens up to the submissions. Find the submission or student you'd like to view the feedback for and click on their name. On the right side the feedback will be shown broken down by question.
Viewing the feedback an individual student has given:
Go to the results tab in the assignment. Click on Reviewers and select the student you would like to view. All the feedback they have given will be displayed on right side broken down by question.