From harbour plaza resort city... How can we get to Ferry boat going to Macau? How much it's cost?

From the hotel, you can take bus no.269B at Tin Shui Wai Town Centre, get off at Austin Road. Then walk southwest around 330 yards to arrive at China Ferry Terminal. The duration is about 65 mins. The ticket fare is 18.4 HKD per person.
There are many take direct ferries that can take you to Macau. The ticket fare is 165 HKD per person.