Promo codes can only be redeemed using the US app store.  The instructions below shows how you can redeem promo codes for people who have non-US iTunes accounts.

Step 1: Login iTunes and go to “iTunes Store -> App Store”.

Step 2: Change to the US app store.

Click on the flag at the bottom and selecting the “United States” flag.

Step 3: Create an US account.

If you have a gmail account, you can use the same email address by adding a “.” into your email address. (e.g., are the same email address).

Step 4: Look for the “Redeem” button at the bottom of iTunes.

Step 5: Press redeem button and enter the promo code that you received.

There is no need to provide credit card information.  Just go to the next step.

Step 6: Then iTunes will display the following downloading status for the application.