Assuming this is a PSR-S700 then you need to undo all the screws under the keyboard and open up so you can see inside under the speaker grill. You will see the grill has tabs that poke through the casing and these are then twisted to keep it in place. Straighten these, push tab through casing going from side to side and then the grill will eventually work free. You do not want to do this too much as the tabs will eventually break with wear.
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