To view feedback for TurnItIn Assignments, you will need to click on the assignment itself:

After you open the submission link, click on the item that you submitted:

Once you open up your submission, you will see where a grade and feedback may be posted by your instructor:

You can then continue to look through your paper as the instructor may have marked specific areas with comments, comment bubbles, highlights, or other editing/grading markings.

Should you have any trouble identifying your feedback, please reach out to your instructor to ensure that they did provide feedback for the assignment.