Circuitmess Sparkly Instructions Manual page 25

Plug in the connector from the holder into the PCB. The slot is
located next to the motors and marked with a battery icon.
Right motor
switch
Left motor
switch
on/off
switch
Turn on both motors by using the switches labeled L and R.
If they are correctly positioned, both motors
should rotate in the same direction.
If they don't rotate in the same direction, flip them
over and check if they are now rotating correctly.
For the next step, we will need the following components: