Hi guys
I can't find this information anywhere. Maybe there is somewhat smart here who can help

)
I am rather new to KrisFlyer and want to make a Star award booking.
What are the rules...
- how many stopovers are allowed?
- can date changes be made after departure to SQ and/or non-SQ flights?
- is the ticket refundable if paid for but not used
- do SQ charge me for all fuel surcharges (ie UA doesn't)?
The routing I am looking at is
FRA-VIE(stop)-BKK-SIN-MEL(stop)-BKK-VIE(stop)-FRA
or alternatively
FRA-VIE(stop)-FRA-SIN-MEL(stop)-SIN-FRA
Cheers
Greg