how do i use gold card in xbox live?

in xbox live im during a partial where it says credit label sort as well as im regulating a bullion label as well as i cant find a bullion label choice where is or what do i do a step 3 upon a game..
ok ty i figured out how cod mordern crusade is amazin upon live ty for a help

Suggestions:


1. its under "redeem code" just put in the code from the gold card but you prob still need to put in a credit card number so they have one on file if you want to buy points and such