Instructors are able to modify grades for Turnitin assignments on the Modify Grade page in Blackboard. From within Blackboard, it is possible for users to attribute decimal grades for assignments.
Turnitin’s Evaluation Viewer does not support decimal grades. Any grade you set in the Evaluation Viewer will be passed back to Blackboard. It is then possible to modify the grade to one with decimal values from within Blackboard’s Modify Grade page. If you relaunch the Evaluation Viewer, the original grade set there will be updated in the grade field on the plugin Modify Grade page, the Blackboard Attempt and in the Blackboard Grade Center.