There are 5 parameters:
1. Speep - delay between flashes
2. Presleep - delay before the first flash
3. Power - power of discharge
4. Charge? - Charge before starting shooting?
5. Number of flashes - Number of flashes
Parameter values (except of "Charge?") are in form of 10^order * value.
For example, if you want to wait for 5 seconds before the first flash, you set presleep=5 and presleep_order=3.
5*10^3 milliseconds = 5000 milliseconds = 5 seconds.
The same for power. If power_order=0 then power means "1,2,3,4,...", if power_order=1 then power means "10,20,30,40,...".
Power=0 means single maximum charge (subsequent attempts will not produce usable flash).
Power=1 means minimum charge (you can hardly see it in daylight), but it can flas@param rh 100 times and more
Sleep is a delay between flashes. sleep=0 means no additional delay (there is still a delay depending on the mode. Fastest flashes are in video record mode. Slowest are in play mode).
Don't let the flashes start too early (while the camera is not yet exposuring) or finish too late (when it already finished and processing the photo) as camera can crash. So don't try "preleep=0".
Here are suggested parameters for your case:
sleep=5 (wait for half a second between each flash).
sleep_order=2 (means unit is 100 milliseconds)
presleep=5 (wait for half a second before the first flash. Adjust if it is bad.)
presleep_order=2
power=20 (experiment and adjust)
power_order=0
charge=1
number_of_flashes=3
number_of_flashes_order=0