You find your OBD2 connector. Get a paper clip and straighten it out, turn on your ignition and then, take a lucky guess at which holes to stick it in........ wait for the flash and smoke to subside
You need the correct software and an obd2 interface connector to reset the SERVICE light.
Dave, Stilo service indicators are coated in teflon and so cannot be removed by mere mortals Xbox owners had included in their packs an anti-teflon tool which allowed them to smash through the forcefield which holds all the letters together and remove the service indicator manually. Xbox owners are to my knowledge the only people who can do this procedure, if you need it doing to your car then I advise contacting Ian direct