Start by parting the hair from one ear to the other.
From the front to the line in the back, make a triangle. Like so.
When I originally did this, it was a lot more polished, but you get the basic idea. You now part from that first triangle, another triangle. Like so.
Now, here is where it is up to you. I parted my middle triangle into two and pulled the ponytails from each side into one ponytail. You could do two ponytails with all of the hair...whatever.
I don't like droopy.
So I pulled the two ponytails into one ponytail. And I made my triangles into a square.