Just look for signs that say TRANSIT or CONNECTING FLIGHTS. Don't follow the majority of peaple that will be heading for arrivals. My advice is to ask the first person you see who works at the airport and ask them That's what they are there for. It's really easy so don't panic. You can't go wrong, for instance if you try to walk through immigration by mistake they will tell you that you are mistaken and point you in the right direction. You have plenty of time to make a few mistakes so don't worry.