Click on the assignment link.
In the “Assignment Inbox” page, click inside the ‘Submit on behalf of student’ box, located at the top.
A list of students will pop up. Select the name of a student on whose behalf you want to upload the paper.
Alternatively, you can type the last name of the student in the search box.
A message saying that you have selected to submit on behalf of a student will show. Click Continue.
On the next screen, add the Submission Title, and click Choose File to upload file.
Once the file is attached, click Upload and Review.
In the next screen, click Submit to Turnitin.
The submission will be shown in the Assignment Inbox.
If you need to overwrite a student submission, you can follow the same steps to upload a new file. You will see a message warning you that the submission will be overwritten. Click Continue to submit.

Step 1 - Click on assignment link Step 2 - Click inside Submit on behalf of student box Step 3 - Select name of student Step 4-7 Click Continue, add submission title and click Choose File. Then Click upload and review. Step 8-9 Click Submit to Turnitin and submission will be shown in the assignment box. Step 10 - To overwrite follow same steps and click continue on warning message.