Nikon camera lena broken with black piece inside lens, fix?

My camera fell and the lens is the only part that is hurt. Inside the lens, there's a black piece that was once secure and is supposed to be connected near the opening in the lens but it is now inside and loose and wiggling inside the lens. I can't focus or zoom and everything is blurry. How do I fix this?

Buy a new camera.

You don't / can't. Buy a new lens. You can get some good prices on refurbished Nikon lens.