You have to go to the "My Store Account". You can either get to it by clicking on your name in the upper left-hand corner or the Store tab on the old site. On that page you will see "Redeem a cash card", "Redeem a code" and "Preferences". Redeem a code is the one that you want as that has the 4 boxes instead of the 5 boxes for the game...😀
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Hope this helps...😀
http://store.thesims3.com/myWishlist.html?persona=lisasc360
My stories on this site:
https://forums.thesims.com/en_US/discussion/991317/my-sims-stories/p1?new=1