If you have everything required listed in this article, the procedure is rather simple:
Contact the airline you intend to travel with so that they can advise the immigration inspection office;
Fill out the yellow entrance/exit card (this is normally given to you on the plane, but if not you can find it in the international section of the airport as soon as you land
Request exemption at the immigration counter (in many airports there are special lines for those requesting exemptions; if you see a sign with the writing “72 hours” or “144 hours” go to the indicated counter;
Once through the immigration counter (they’ll attach a sticker on a page of your passport and stamp it with the entry date) get your bags and leave the airport as you normally would.