Step 2: Folding
then fold the whole thing in half so the loose end of the paper is on the inside.(last 2 pics).
Step 3: Poping!
pull the two loose corners of the paper up and pinch the bottom corner below that.
your'e all set. now there should be two little pockets at the top of the popper. point that down, and hold it about at your ear.
now swing down so the air catches those pockets and "pops" them open. if you did it right it will create a loud bang.
if it didnt work, or it isnt very loud, try making the creases sharper, or swinging your arm harder.