After starting iTunes you need to choose the iTunes Store. In the top right corner you find a field to login to iTunes, if you are already logged in you’ll there see you’re e-mail-address. Click on it and a menu pops over. There you find a menu item to convert one of my promotion codes.
Shame that I saw some codes had been used but people didn’t post it back here that they used it or say thanks.
Awful nice of you to post those codes here where there’s writers!
p.s. – I’ve never used redemption codes for an app before (just gift cards), and I have to say that apple needs to polish that turd a little. My iPad said it was downloading (it wasn’t showing me that), it didn’t appear on the purchased list on the iPad, so I went to the iPhone, and could download it from the purchased list (???) then, much later, my iPad showed the iconand it had the progress bar with “Paused”… So, I got it, but the wierdness of the iPad made it seem like I wasn’t getting it.