I have this game on steam but i can't play because i need a CD key that does not work anymore. and the only way to play is using this site. is there a way for me to trasnfer the game over place help me?

Hi !
Well, if you own it on steam and don't want to purchase it again on GOG, your only way is to wait for a "GOG connect" operation : during limited time, some games are allowed to be "connected" from your steam account to your GOG one. So you'll have to wait for a GOG connect operation where the game is eligible, and at this moment redeem it on GOG.

For more info, take a look here : How does GOG Connect work.

Hope this helps :)