Creating a Turn It In Account 

http://turnitin.com/

I've had turnitin check my own papers, but today I set up a teacher's account and added three classes, plus their assignments.  The process was fairly easy with prompts took me about an hour, after I laboriously procured the correct account ID and password from my department.  My only confusion came with adding a posting date, immediately after the initiation of the assignment.  I wanted to be able to post about papers that came in early, so I did not make my posting date the same as my due date for each assignment.