Cigarette Lighter Socket - Barina

Evening all,

I know this may seem like a simple install/problem but, I recently acquired a 1994 Holden/Opel/Vauxhall Barina/Corsa. The car came with a spot for a cigarette lighter but it was not fitted with one. I bought power socket kit but I have no idea how to install it, the kit did not come with any instructions. Do I have to wire it in with the ignition? or will be there be some form of hidden plug i can wire it into?

Cheers in advance