How do you change the park plugs on a Peugeot 307?

you tacke the top covere of on top of the engine with a star bit then you will see a black long thing and it lookes complecated. but with the star socket you will see silver star screws a gain it is the version of htd leeds unscrew a gain and tacke of the two black hoses you push the yellow clips in and pull on them and they cume off then lift the unit out and you will see the spark plugs replace them , my Peugeot i replaced them but it is the managment system on the fuell system side good lucke and best wishes