1) Download the progam that will let you add VC to your Xbox Live Account/PSN account.
2) Put your NBA 2k13 save onto your USB and plug it into your computer/laptop.
3) Open the “VC” program and insert your save game.
4) You will notice your current amount of VC in the program. Simply change that amount to how many you would like to have.
5) Click “Save” and then put your USB back onto your Xbox 360/PS3.
NOTE*** If you DO NOT have a USB Flash Drive, you will still be able to do it by just entering in your Gamertag or PSN. That method will be shown in the download below.