If you are using the "standard" Turnitin website and haven't received the ID, send a quick, polite email to your teacher or TA. If You Are an Instructor: Log in to your Turnitin instructor account. Look at your All Classes homepage.
Most instructors include the Turnitin Class ID and Enrollment Key in the course syllabus or the "Assignments" section of your course handbook. class id turnitin
Beyond just "getting into the class," the Class ID is vital for: If you are using the "standard" Turnitin website