The Silverstone FP36B for example - to install:
1. Install the SilverStone FP36B in any free 3.5" bay in the front of the case.
2. Pull the USB 3.0 cables through e.g. remove a PCIe 'blank' or any 'opening' to the rear of the case.
3. Plug the USB 3.0 cables into the MOBO's USB 3.0 plugs, blue ports, at the "board has only usb 3 at back side"
See manual -> http://www.silverstonetek.com/product.php?pid=275&area=usa
If you require MORE USB 3.0 ports, the you need something like SilverStone EC03 -> http://www.silverstonetek.com/product.php?pid=302&area=
or Koutech IO-FPH431 4-Port USB 3.0 Front Panel Hub http://www.newegg.com/Product/Product.aspx?Item=N82E16817364031
The problem with a HUB is that you are 'splitting' the bandwidth.