If i'm not mistaking the pins you are looking for are located at the bottom right of the board right next to the onboard power button. They should be labeled in a small chart something like PWR, + HDD LED - etc. Find the respective labels on the case front panel wires and just plug them in.
To give you a vague idea how it looks, here's a very basic, but nice video by newegg. http://www.youtube.com/watch?v=d_56kyib-Ls
Paul first mentions it @ 14:23 then explains a little more @ 35:02.
Hope this helps and good luck!