Its a 3D sticker at the bottom left corner on the back of the CD case and it has numbers and possibly capital letters.
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Its on the top of the back of the booklet in the case the CD came in
You need to enter the code that is on the very back of the Sims manuel.
Inside your Sims3 CD case, there is suppose to be an booklit that has the same cover as the CD case. Look at the back of that at the bottom. If you don't have the booklit, go back to the store that sold it to you with your purchase-slip, and ask them for the booklit. If for some reason you have a booklit that's black and white on the outside, you might have an coppied CD/CD case/booklit/Game. If you have an booklit, but there is no number at the bottom-back, go ask the store you bought it at for help or look inside the case somewhere, it might be there...
The registration code for "The Sims 2 - Double Deluxe" will be located of the CD or DVD cover. Each code is unique.
The CD Key will be on the back of the CD case you purchased.