balck and white cd key please read and help

[mr club]

ok belive me or no i have the real version of the game i purchased it second hand and guess what?
the manuel was not with the game the manuel had the cd key on it hence my problem?
i could take the game back but i would rather just bang in the crack or whatever you guyz use
if im screwed please tell me and i will take the game back.
thankyou for reading and i hope you can help.
please dont supplie the search option as it doesent really do much i tried.
thanks again