can drop him an email and fix an appointment with him...prior to that, you need to give him some info such as roughly u and your partner want to tie the knot at when...plus both your birth dates & your respective parents' date of birth...he will do some calculation for you and debrief you n your partner on the details etc...
at least i recall that was what me and my wife-to-be did and we actually meet up at david at novena coffee bean...he's a friendly FSM with the handy ipad,ha