The first Apple Macintosh computer to feature a Universal Serial Bus port was the original Apple iMac, introduced in 1998. Since that time, every new revision of Macintosh hardware features a USB port ...
Give some tips for you,hoppoing can help you a little.
1?Power on and boot the Mac.
2?Connect one end of a USB cable to the USB hub.
3?Connect the other end of the USB cable to an available USB port on the Mac. The USB hub is detected and configured automatically. Any devices connected to the USB are also configured automatically.