To search for duplicate candidates:

1) In the candidate screen, click on the "Search" button
2) Now, to the left of the label "Candidate Status", select "Possible Duplicate"
3) Now click on the "search" button at the top of the screen, to return all possible duplicates in your search
4) To browse through the returned candidates, click on the "List View" button
5) In this screen, you now have the option to delete a candidate by clicking on the trash can icon.
6) To return to the normal browsing view, simply click on the "Browse" button at the top of the screen.