Usually there is an internal USB header that you connect the front ports to. I looks similar to the front panel header but is smaller. It should be 10 pins (5x2). I looked at the pdf for your mb and they don't mention it. That makes it very hard to connect anything to it because you'll need to know the pinout of it. MB manufacters that include crappy manuals should be shot
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Try contacting the mb company and see if they will give more info.