after this you remove the cover which encloses the slip-ring, which is actually a ribbon wire, you need to tap into this ribbon wire there are 2 unused wires within it... so you connect each wire from the buttons to this, this is tricky, you have to be good at soldering here else it'll ruin the wire..
ok so now you have the buttons connected at the side of the ribbon wire which appears in the steering wheel behind the airbag.
(the buttons that you will have bought screw in and it is obvious here once you remove the airbag.
now you take the feed from under the steering column as in the original how to, then you connect each of the 2 wires to the other end of the ribbon wire, if you follow the ribbon wire into the steering column you will see a connector and plug, the plug is the end of the ribbon wire, it is easiest to attach the 2 wires here..
and thats it job done,

i hope that helps, im sure you will have additional questions, but the basic principal is that you need to tap into the two unused wires within the ribbbon wire, adding the wires from under the steering column to one end and the wires from the buttons at the other, in the steering wheel..
it will become clearer when you start to get things apart... like ive said tho, just ask any questions, its hard to write a how to as i didnt take any photos of this process as i just wanted it done quick didnt want to faf about with the camera.
