fitting a 3.5 jack connector to RNS -d

[goldsax]

2001 FL A8 D2

need some help please.
got a connecter that fits in the cd 'slot' of RNS.
(i am sacrificing my cd player facility to play tracks from the phone)
the connector has a 12v blue wire that needs to be connected/spliced in.
any guidance (if possible with pics/links) on which wire i can hook the connector up to in the vicinity of the RNS unit.
thanks raj