The hatchback door will not close using the button on the door and it will not open using the button on the inside of the vechile.
check the fuse for this. it could also be the switch itself.
Where is the fuse??
If you don't have an owners manual, you can Google the location of the fuse box for your car. On many vehicles it is on the drivers side of the dash accessed with the door open. On some vehicles it is under the hood or in the glove compartment. There may even be more than one. Your owners manual should be able to help. You can Google almost anything these days, but if you want an owners manual, try books4cars.com.
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