really asking this?
only hard part is the master link
put your shifter into neutral.
take one end of the chain and wrap it around your front sprocket.
pull the bottom of the chain udner the rear sprocket and wrap it around.
then use masterlink to contect the two ends.
did it pop off?
if you loosen the two main nuts holding the axle carrier on, then loosen the chain adjusters the axle carrier will turn. hence shortening the distance between the axle and the motor