Click on "Accounts and Lists" near the top right-hand corner
Click "Your Account"
Look at the "Ordering and Shopping Preferences" box and click on "Your Amazon Profile"
Click on your review under "Community Activity"
Note: If there is nothing there, your review is still being processed
Update for 2019 and what if you only have view only on the file?
Select the file and click remove. Having read only you won't delete the file itself but you will delete it from your view, your Shared with you folder, and your future searches.