macau back to hongkong, how to clear the custom

Just take a ferry from Macau back to HK. I remember there is no need to clear the customs.
I suggest you go to Macau Maritime Ferry Terminal, where there are frequent ferries back to Kowloon and it takes around an hour.

i fly frm singapore to hk airport. i have read some reply that i need not go out but direct go to level 1 to take ferry to macau.

what you meant need not to clear customs. Are you refering that when i reach honkong i can go straight to take ferry and clearc at macau custom.

My concern is after my 2 days stay in macau , i will stay hk for 2 days, wanted to check frm hk i can fly firect to singapore on 4 feb.

tks

If you use the Skypier to Macau, you do not need to pass the custom in HK, otherwise, you may need to pass the custom.
After two days, you can check in HK and then fly to Singapore.