what is the number of bus and how to go to repulse bay from Hong Kong park?

From the Park, you can walk the Queensway, Admiralty Station to take the bus line 6A to Repulse Bay, Repoulse Bay Road and then walk to that bay.
For back, you can take the same bus line to reach Central (Exchange Square) Station and then walk to the Central mtr station to take the Tsuen Wan Line to Tsim Sha Tsui Station. Then follow the direction boards to find the Star of Avenue.

Dear Conald,
Thank you for your clear explanation. It is helpful