Start prying/loosening up the edges of the OLD rubber pads from inside the key which are lightly adhered to the key case…be gentle & careful!
Then gently press/push the rubber pads thru the holes from OUTSIDE the key…careful not to break off a small ridge/ring of plastic supports that keep the edges of the rubber pads from being pushed back inside the key case under normal use of the buttons.
You can see the ridge/ring supports that surrounds each hole…be CAREFUL not to cut through or break these tiny pieces off!