After you have punched out the 3 shapes, fold them directly down the middle. Once again, if you have different designs on each side, you can fold them in opposite ways and achieve differnet looks. Decide which one you want to be on top and fold it so that the side of the paper you want is on the inside of the fold.
Now, with a butterfly, the trick is to put a little bit of glue on one of the wings and then glue the wing of another butterfly to it and line them up just right so they are back to back. You want to glue the 3 shapes together-- one in the middle and then another one glued to the back of each side of the middle one. This is where you want to decide which direction to have the paper fold, so that you see the design that you want poking out from behind the top butterfly's wings. Do not glue the back two butterflies together.