I circled the 3 pins where you connect to in red here:

Looking at the controller board straight on in the present orientation, the ground should be the pin on the top (double check with voltmeter) and the other 2 are tx/rx.
Once you confirm the ground pin, connect tx and rx....if you get a load of junk on your screen reverse the rx/tx and you will see magic...well not really but you will see the data on the screen...for putty set 115200, no flow control, and make sure you have the correct COM port defined...
I posted a direct link where to get the cp2102 earlier (the tx thing)

...it should be the same or better version than the one I got years ago
http://www.dx.com/p/usb-to-uart-5-pin-cp2102-module-serial-converter-81872#.VI6YldJ0yUlThere is no bs ad commission or anything for that part...you can order it anywhere on the net..I am just providing the link where I got mine to make things easy (or so I thought)
Everything you need is right here in this post...no guesswork involved just RTFM

In Short...you need the thing in the picture (link provided) putty for serial connection and 3 bogo pins (that's what the gold pins are called) or alternately you can just use sewing pins and push the sharp end into the connector MacGyver style, just don't move anything once you have them connected

Last of all...don't hold me responsible if anything goes wrong...but if I helped, a thanks would be great
