Shuttle bus to Royal Pacific hotels and Towers, Hong Kong

Hi, I have a question about your free shuttle bus service. I have look through your information about free shuttle bus to hotel but I'm so sure about how is it work? well, saying that I would like to go to Royal Pacific hotels and Towers by using your free shuttle bus service then I have to purchase single ride which cost HKD 90 then present this ticket along with my boarding pass. Am I right? then after I arrive at the airport where should u go for purchasing ticket as well as boarding.

thank you