Stick the copper foil tape on the gray line.
** Apply the copper foil tape in a continuous line but not in separate pieces, even when joining the tapes at the turning points.
Remarks: DON’T break the copper foil tape to do a turning point.
Fold the left corner of the bottom page according to the dotted line & place the battery at the circle with the "+" sign on top while the "-" sign at the bottom.
Flip over the folded corner to cover the whole battery, and clip the battery in place with a binder clip.
Stick the LED on the gap between the copper foil tapes (location is shown as dotted circle). The light will be turned on!
With the LEDs, cut the page out according to the dotted line and you can slot the circuit at the back of your doodle.