Drag the charger to the bottom of the phone to charge. If you can charge the phone to 100% you get you name on the list for people who did it. You can press the home button to turn the phone on and look at status of battery and clock time
I don't know what inspired me *cough cough* TheSimpsonsEpisodeWithTheVirtualYard-work Simulator *cough cough* If you look inside the battery code (click :see inside in the corner) there is a cheat