You need PMX editor, which you can DL here: http://fav.me/d8yr374
The head bone's Japanese name is 頭
While the head bone's invisible connecting japanese name is 頭先
IF you have any questions, please don't hesitate to ask, I'll try to get back to you ASAP.
Please, do NOT comment asking me to add physics/joints to your hair. I made this tutorial so YOU can do it!
