Remove these, I think they were Torx20. Then lift the pods out.
The cable runs into the dash and behind where all of the stereo wiring is. Whip the stereo out
and you'll find the 6 to 10 way adapter unless you have the trip computer.
The 6 to 10 is a short lead that joins the pods to the car's wiring.
Don't lose it with the rest of the wiring.
If you have the trip computer, both the 10 way connector and the 6 way connector plug into the trip computer.
Fitting is the opposite of removal however, this page goes into more detail.