Go directly to T2 and enter the service hall. Then there is a display screen in the lobby to find your flight number and flight destination, and then there will be a window number for you to change your boarding pass. After you get your boarding pass at the window, your boarding pass will have your boarding gate number. If you find your boarding gate, there will be security check on the way to the boarding gate. If you are not familiar with these procedures, you'd better arrive at the airport early. If you are really unfamiliar, you can ask the airport staff. It's not very complicated. Have a nice trip.