Yes you plug that oversized looking USB stick into the
OBD port, and connect to your phone via bluetooth. Prior you need to download the carrista app, which I think has a week long free trial period. Or you can see which functions it has, and once you seen them, start your trial and make the changes. There are no wires required. If i recall corectly, just below the light switch, there is a covering, if you gently open that, you will see the
OBD port there. I'm not sure if you are based in London or how urgently (or annoyed you are with the fogs) you want to try carrista, but i do have carrista that i used once and it is not compatible with my current or future car. Rather than collecting dust, it could go to a new home..