If you have the pin, you can enter it in and uncheck all of the boxes you want to remove the pin on. But, if you don't have the pin and you don't have email access, you can't unpin it unless the email change is unpinned.
We do have a very reliable member who has a pin cracking service- Demo. If everything is pinned and you don't have the pin, you can always ask him to pin crack. It does cost money, though.