Ah, your front panel ports are USB 3.0. Unfortunately your motherboard doesn't have the onboard USB 3.0 header to wire up your front panel ports. You only option would be to get an adapter and plug them into either of the 2 USB 3.0 ports on the back panel (I would route the cable through one of the rubber grommets for water cooling).
Its not clean but its the only way for boards that were released with USB 3.0 but before the onboard header. I have the same problem with my mobo.
Were you able to wire up the case fans? You should run into no problem there.