Step 6: Trapezoids?
First, turn the origami around so you can't see the square in the center.
Then, if you pull back one of the flaps, you'll see a crease going from a corner down. You will have to pop up this crease. The images may be sort of helpful for this.
Simply put a finger beneath the paper, right under the crease, and push upwards.
Reinforce the marked creases so the figure looks more 3D.
Do this to all four corners.