How to manually delete submission to allow resubmission
Go to the Turnitin submission inbox.
Locate the students assignment and deletes that student submission by clicking on the rubbish bin icon. (A message will appear requesting that you confirm the deletion)
Notify the student that the assignment has been deleted and they can now re-submit.
The student resubmits and the resubmission automatically appears in the Turnitin inbox. The student can also inform the lecturer after resubmission.