In private messages on the gray bar that says 'Inbox'.......go to the right and above 'date' is a small square box. Check that box if you want to get rid of everything or select all the ones you want gone. Go to bottom blue bar that says 'selected messages'. Click on that and you can do lot of things......even save to special folder that you've created.
Hope that this helps someone, even if it's too late for you sewbizgirl.