DDJ-FLX4 Hardware Unlock

I just got my DDJ-FLX4 and I'm having a lot of trouble trying to figure out how to get Rekordbox to recognize the controller. I use Rekordbox 6, and I know that I have to hardware unlock DJ Lite in order to use my DDJ, but I don't understand how to go about that. I've registered my DDJ but for when I click on "My Page" there isn't an option for me to activate my DDJ even after I've checked active devices. I'm not really sure where to go from here.