1)  The pins to use on the launchpad are j2 pin 3 (RX) and 4 (Tx).  Nearby, J3 pin 2 is ground.  Note that each row is a different "J" number on the board, and the count 1,2,3 etc from the USB connector end.  Jim numbered them on his schematic somewhat more sensibly, but they don't match the board.  

2) This is not using the N2HET.  It is using a regular SCI UART.

3) There is a lot of code that can be removed to reduce confusion, and someday I'll do that.  The N2HET is not used at all.