Where do I connect the internal USB wires?

I have a MSI K8T Neo FIS2R motherboard and I am not quite sure how to connect the internal USB wires. This motherboard comes with a special back plate with 2 USB slots. I also have 2 front USB ports on the case and a floppy drive that also has a USB connection for digital camera cards.

The motherboard has two sockets, each with 9 pins. I originally hooked up the front USB ports, each of which has a 4 pin wire and a single pin ground wire. The back plate USB thing has a single 9 pin connector that takes up a whole socket. The floppy drive USB wire is only a 4 pin connector, with no ground wire.

If I attach the floppy USB wire I only have the top 4 pins left. This means one of the front USB port wires must go in the top 4 pins. The instruction manual says nothing about using the top pins. Plus there would then be no place left for that ground wire that comes with the front USB ports.

Can I use those top pins, and can I use that front USB port without attaching its ground wire?

yes you can use the usb without the ground pin. unfortunately, your mobo only come with one double header. you can split it anyway you want or you can get an pci usb card that let's u plug in the other usb internally.

I don't use my front usb port, I use one of of the header for the front card reader and an extra 4 port pci usb2 card on the back.