Protoshield Kit UART Pinout

I’ve soldered up the pins and USB jack to the protoshield. I’m not sure what’s next though to make the USB port functional. Where do I connect the 4 USB pins?
ProtoShield_Kit[1].jpg

I am having the same problem and I am finding no material on how to actually wire it up. Has the person who first posted this comment found the answer? Or does anybody else know?