You go to any booking offices like Toa Payoh Sports Hall to confirm your identity.
Sports Corporate - Booking Offices
Once you login you go to 'Preference' on the left menu. You have 1st choice, 2nd choice and so on. Every month there will be a ballot. Those slots not taken up during ballot will be free. Forget about some fields *like First Toa Payoh because there is insider job that wouldn't allow you to book certain fields.
