Get your paper
Fold in half lengthwise
Fold down top edges to the midline so you get 2 right triangles at the top
Fold these triangles down the mid half of the paper
Fold in outer edges to a bit over the point at the bottom.
Fold up the bottom point over those edges.
Fold the paper back along the midline again.
Fold down the wings like so. Do this to both sides.