Re: cd changer and washers??
Hello and welcome!
Assuming you've checked there's some water in the washer bottle, try clearing the holes in the tubes that are attached to the blades by poking a pin down them. If you do have to remove them, they come off by gently prising back the ends of the 2 or 3 clips which hold them on. The clips do break quite easily, but can be replaced with zip ties, or new blades with clips are only about a tenner each.
The CD changer normally lives on a shelf inside the boot, to the left of the spare wheel, so that's where the connector will most likely be if there is one. On mine it's a single round 13-pin jobby that provides power and signal.