Once you pull the keyboard off, you will see a ribbon wire connecting the keyboard to the rest of the laptop.

To detach the keyboard from the rest of the computer, you have to unlock the ribbon by pulling up on the small black lock keeping the ribbon from being removed. You won't have to pull very hard, so be gentle to avoid damaging it.

Once the ribbon is disconnected from the computer, you are able to pull the ribbon out from underneath the lock, and then pull the keyboard away.