the case has Front Ports 2 x USB 3.0, 2 x USB 2.0, Audio
they usually has different color for usb2 and usb3.. with the usually the usb3 is blue
the front panel audio usually a 4 pin single line connector it cann connected to Front audio pin in mobo usually near the audio chip ...
i will check the layout of your mobo and see...
edit: the picture on web and asus site is horrible.. can u check on the manual book, they will have the explanation..
I saw don't see there is a usb3 connector for front port on your mobo, either the mobo don't have it or it was old standard where the each of usb3 port is separated unlike the newer standard where the 2 usb3 port is combined into one connector...
My mobo also have this problems.... (case with new standard 2 in 1, mobo still using old standard each separated)