Hello there, @lt19j Welcome to the Canvas Community. Thank you for posting your question. Your question is one that is asked from time to time here in the Community (you can always use the magnifying glass at the top right corner of any page here in the Community to search for keywords such as "access" or "turnitin", and you'd find similar questions with responses ... How do I search and filter content in the Canvas Community?). Here are some previous topics on accessing Turnitin that you may find helpful:
I wasn't able to tell by your e-mail address tied to your account here in the Community if you are an instructor or a student, but hopefully one of the above topics will help to answer your question. If not, please provide some more details on how we might be able to help you. Thanks!