A common request is to allow students to view their similarity reports before they have to turn in their final submission. In order to do so, start by creating an assignment following the instructions on How to Create a Turnitin Assignment.
To make certain that it does not impact student grades set the assignment to be worth zero points.
In the Plagiarism Review drop down select Turnitin. For the option “Store Submissions in” drop down the option “Do not store submissions” should be selected, and the “Show reports to students” should be set to “Immediately.”
This will create an assignment that students can submit to in order to see their similarity report, but won’t impact their grade. Students will be able to submit as long as the assignment is open.