TOPIC:

Hello,can someone now the steps to how i switch off the service light (orange key)?
Thanks.

First of all... Why does it lit? Is a note on board computer like 'change oil now ' or 'due service now' or is there any other reason for it?
it is not just a service light in meaning do service inspection... it warns you also that something is wrong with your viechle and you still may drive on but visit garage ASAP... in that case only with Can Clip or simmilar is wise to reset error and turn light off. 
Otherwise, to reset service interval, procedure is written in manual.

Every year i have to make service or if i run 15.000 km.So it's the  light of regular service.They program the car every year to show me the massage <<25 days to service..5 days to service..4...3 days...>> and if i don't go to make service and switch it of then show me the light of service.That is the reason. 

Try this page HERE

Also Youtube

Actualy there are two types of sevice inspection... A and B. And A should be applied every 12 month, B every 24 month or 30000km, what occures earlier. If you do more then 15000km in 12 months you can join both types into one general inspection.