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FIRST SHUT THE WATER
1) in the handel dead center there may be a piece of plastic that is red and blue remove it it should pop off if it is missing there will be a hole showing ( when i sa dead center i mean looking at the faucet under the part of the handel you lift up on
2) insert a alen key in the hole and remove the screw then remove the handel
3) you will see the top of the cartdrig around the cartdrig and under the handel there is an escution turn it clock wise and it will come off
4) under the escution and around the cartdrig there is a hex nut with plyers turn the nut clock wise when the nut comes off you can pull out the cartdrig
now install the new parts and resamble