It's a stalk that snaps into the steering column behind the wheel below the turn signals.
It has a plug with two wires that run to the third plug on the stock HU. For the 6006/9006 it is the smaller plug in the center of the radio. For the single disc it is located between the two other plugs.
Either cut a hole in the exhisting lower surround or get the surround with the propper hole.
The white/black for pin 11 and brown/yellow wires are the radio control signal wires. Simply connect the colors.