Your professors are the administrators of Turnitin and it is not designed to be used by students alone. If you are using Turnitin outside of Blackboard, your professor will create a class page and send you the code to join. Look for the assignment and upload yours as demonstrated in the quick start guide below. Keep in mind that some assignments are set up so that you can revise and overwrite your original upload until you are satisfied.
Before you submit a paper to Turnitin...