If it's anything like I've experienced then it'll be a long wait. My plug was difficult to fit into the screen too but once I worked out it needed to be pressed tighter together it went in OK.
My wiring was all wrong because the y cable was wired for US cars (I did email sales before I bought it and they said it worked on UK ones - if it does they sent me the wrong cable).
If you disconnect the box does your nav screen still work? It shouldn't. Similarly, if you use the toggle switch the nav screen should not work either. If it does then you have the wrong y cable. Maybe you've got mine!!!!
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