There are two kinds of code:
Credit codes add credit straight to your balance. Go to Billing, choose Redeem a code, enter it and choose Redeem.
Top-up bonus codes add credit when you add funds. Enter them under Have a promo code? in Add funds. The credit is added only when your payment goes through.
Promo credit appears on its own line in your transactions. If a code doesn't work, the message tells you why. For example:
it has expired or been fully used
it's for new accounts only
your account has already used it
it needs a top-up of at least a certain amount
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