In order to get the best light possible, it is important to know at least five different portrait light set ups.
For the hair light, take one of the smaller lights and tilt it down above the subject’s head, turned down so it just highlights the hair.
For more details on each of these lighting set ups, check out the original tutorial, where I grabbed these lighting diagrams from.
Also, these diagrams were made by using this application:
http://www.lightingdiagrams.com/Creator, so you can create your own!