Thank you for using Just Answer for your needs. We are talking about the rear speakers in the deck lid by the back glass correct?
It will take some effort but what you will need to do is pull the back deck lid out. Start by removing the bottom and back seat seat cushions, then remove the C pillar trim on both side of the car and then pull of the rear deck lid to expose the screws holding the speakers in. The pics below are not the same but similar to what you are trying to accomplish.
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