Send a professional email or check your syllabus:
Finding your class ID and enrollment key (password)
If you are frantically searching for "Turnitin login class ID and password" but your school uses Canvas, you are looking for information that doesn't exist for your setup. In this case:
If you are stuck on the "Class ID and Password" screen, run through this checklist:
Do not simply Google "Turnitin." The commercial site (turnitin.com) is for instructors. Students must often use a specific branded portal. Look for: