How do you set up the IR remote? Mine doesn't seem to be working...

On the diagram in the assembly instructions it mentions servos with indexes 4-6 but they arent on the diagram, where are they and what is supposed to plug in there?

`I plugged in the red FTDI chip into my NyBoard 2.0 and then plugged it in via micro usb to my computer, Rx and Tx blinked for a second and power remained lit, but then I heard a high pitched squealing noise coming from one of the board (unclear which one) and one of the other lights aside from the power lights remained on. I quickly unpowered it so as not to damage it further, any idea what happened and how I can properly set it up?