The LCD module from Sparkfun accepts serial input, making it simple to communicate with on the Raspberry Pi's UART Transmit (TX) pin.
This circuit uses three pins on the T-Cobbler breakout board - 5V, GND, and TX. For more information about the GPIO pins, refer to: http://elinux.org/RPi_Low-level_peripherals
Be careful about running wires next to the 3.3V regulator - it will be producing a modest amount of heat.
Bonus: Now that the LCD module is connected, some quick Python scripting will let us control it. Try the following Python "Hello World" script:
import sys, serial, time
LCD = serial.Serial('/dev/ttyAMA0', 9600)
LCD.write('\xFE\x01') #CLEARS THE LCD
LCD.write('\xFE\x80') #SETS THE CURSOR ON THE FIRST LINE, FIRST CHARACTER
LCD.write('\xFE\xC0') #SETS THE CURSOR ON THE SECOND LINE, FIRST CHARACTER