How do I set a course submission comment for a Turnitin Assignment?
The account administrator can set a standard comment that all students will see when turning in a Turnitin-enabled assignment.
Course instructors can add their own personal message to be shown for any assignments in their course.
Edit Course Details
Click the Edit Course Details button  to edit the submission comment.
View Course Details
Enter your message in the Turnitin Submission Comments  field. When you are finished writing the comment(s), click Update Course Details .
Note: This field will only appear if Turnitin is properly configured on your account.