Looks faily simple to follow those instuctions.

You have cable B. Check the table on page 10.

The 6 pin jobbies (black, white) connect to the vehicle harness. White is power, GND, navbus and iBus etc. Black is speed sensor stuff. Check your loom to make sure they are present. Should be near the wheel arch wedged into the loom.

Wine Quadlok is the power and data for the nav.

The video signal on a regular car (blue and/or white plugs) comes out of the nav, into the TV, then off the the display. I assume your TV monitor has one empty socket, and the blue plug goes from the nav, into the TV (white), out of the TV into the monitor.

The remaining one could be nav audio, and must plug in to the existing loom. What are the wire colours? The audio sometimes goes throught the chunky white 6 pin.

Nav antenna goes under the rear parcel shelf, and can be bought from eBay. I think the connector is MCX but double check, as it could be FAKRA or SMB. Post a pic of the back of the nav and the existing harness connections in the car.

BTW, all those lever arm connectors are called 'Quadloks' or MQS for short.