The easiest and least expensive option is to take advantage of the Sky Train. Airport sky train signs are located throughout the departure zone just follow those to the kiosks where English speaking customer service can help you.
Buy a 1 way ticket for or a round-trip for $90HK prices as of August 2015.
Be sure to present your airport pass as it is a complimentary service with any airport train pass.
The K4 bus makes its first stop at the Sheraton Towers Hong Kong. Wahlah! You have arrived and now it is time to enjoy beautiful and innovative Hong Kong.