I Tunes Gift Card

Okay, Back again! Hope everyone does not get sick of my questions :-)
I have a I tunes gift card. I would like to use it to purchase some apps (games). I logged in to I tunes on my iPad; when I attempted to make a purchase it only gave me the option to use credit cards. No option to use I Tunes gift card. What did I do wrong?
Is it better to make the purchase through my iPad or do I have to use my PC? If I have to use the PC how does the app transfer from my PC to my iPad. I would really rather just use my iPad and not use the PC to make the purchse...seems like it would be more convienent.
Thanks!!!!!!

Got to appstore, featured, scroll to bottom, click redeem. Enter code... Download apps :)

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