Fold and unfold the paper in half both ways.
Fold both in along the dotted lines.
Fold and unfold the bottom and top along the dotted lines.
Fold the paper behind along the dotted line.
Turn the paper over.
Fold top of the paper down along the dotted line.
Fold the paper up along the dotted line.
Fold and unfold the paper in half and leave slightly folded to give a 3D look.