To view student submissions when logged into Turnitin.com make sure you have an instructors role by selecting the Instructor tab at the top left of the screen.
Then choose the tab my classes located near the turnitin logo.
Select the class you wish to view assignments in by clicking the linked class name. A list of assignments will appear. Choose to view the assignment you wish to grade by clicking view in the actions column.
From this point you can choose to grademark the paper or view the plagiarism report
For specific information regarding the originality report, please refer to this video provided by Turnitin.com
If you are accessing the Turnitin Assignment via Blackboard, first you will need to make sure you have a teachers role by selecting the Teach tab. Then from the Course Tools menu on the left of the screen choose Course Content. Navigate to your turnitin assigment. Click on the assignment icon and Blackboard will automatically load turnitin as an embedded feature of Blackboard.