how do u use the code and where do u put it in to the game
Sorry for the late reply, being there is no cheats for this game nobody bothers to make posts for this game here. You go the the World of Tanks website, login and go to account management. At the bottom you'll see a option to put in a bonus code. After all effects of that code if its still active will be put on your account straight away.
Btw, if anybody knows of any still working codes or some come up in the future please post a reply. I always seem to miss these things.