1. Within your Blackboard site’s Control Panel, click on Course Tools > Turnitin Assignments.
Screen image showing the Blackboard menu Course Tools and Turnitin Assignments link
  1. Select the link to the submission point you wish to view.
  2. Click on the % Similarity Index next to a student’s submission.
  3. The student’s Similarity Report will open

For further instructions, please refer to Turnitin’s own online guidance:
The Similarity Report explained
Interpreting the Similarity Report
Similarity Score ranges
Downloading the Similarity Report
Viewing Similarity matches
Viewing Sources
Refining the Similarity Report
Generating a new Similarity Report
Accessing the text-only Similarity Report
Multicolour highlighting in the Similarity Report
Flags
Similarity Report Exclusions