Step 2: Lay down the copper tape + bend the card
If you feel so inclined, you could also add extra copper tape traces, for indicator LEDs and whatnot -- but this is not essential for a functioning arduino charge card.
>>Note that the copper tape conducts best along the surface without the adhesive. It doesn't conduct reliably through the tape thickness.
>>You could solder to this copper tape surface if you wanted, for certain projects -- the copper tape is a joy to solder to - but it's not necessary to power an arduino. A few more steps and we are there...