You just purchased Live view and realized it doesn't come with OSD.
Here's how to add OSD to this kit....
APM MinimOSD Rev. 1.1 Kit $49.99 - http://store.3drobotics.com/products/apm-minimosd-rev-1-1
FTDI Cable 3.3V - $17.95 - http://store.3drobotics.com/products/ftdi-cable-3-3v
Servo Extension Cable Female-Female - $1.25 - http://store.3drobotics.com/products/servo-extension-cable-female-female
MinimOSD cable for Pixhawk $4.00 - http://store.3drobotics.com/products/osd-cable-for-pixhawk
You need the FTDI cable if you want change what is displayed on the screen.
Follow the instructions for the GoPro cable to attach to the MinimOSD board. Using the Extension cable plug the cable into the MinimOSD board with the white wire to the edge of the board. On the transmitter the black wire goes to the edge of the board.
Match the wire colors found on the MinimOSD wiki site - http://copter.ardupilot.com/wiki/common-minim-osd-quick-installation-guide/
Or use the Video/OSD Kit intructions - http://3drobotics.com/wp-content/uploads/2014/07/FPVOSD-Kit-Manual-D.pdf
You just need to find a place to put your MinimOSD board. I hot glued it to the transmitter.
Please note this works on IRIS not IRIS+ that has Telem 2 used for the radio. To use MinimOSD on IRIS+ you need a Y cable or remove your radio from Telem 2.