buy grift card

this article entails how to use an iTunes gift card. You will learn about where to get one and how to actually use the credits.An iTunes gift card is not like a regular gift card. You do not have to leave the safety of your home to use it. The only things you need are a computer and an iTunes gift card. The computer must have iTunes installed in it. If it is a Macintosh computer, it already has iTunes incstalled in it.
Steps

Open up iTunes and press the iTunes Store button on the Navigation bar on the left hand side of the screen.
Check on the iTunes gift card what country of iTunes it can be used on. They are not interchangeable. So, if you are on the wrong country then go to the very bottom of the store and press My store. You will then be able to pick the country of your choice.
Scroll back up the page and go to the right hand side. You will see a box and it should say, Redeem. Press that and enter your code located on the back side of your gift card.
You may need to either sign into an iTunes account or to get one. Follow the steps that come up on the screen to do that.
Once you have an account, your money will be automatically put into your account.
Buy any of the songs, videos, audiobooks, games, TV shows, or movies of your choosing.

Tips
Don't compulsively use your whole gift card in one session. Often you may regret not being able to buy a song you really enjoy because you bought a ton of songs that you barely listen to.

Warnings

Make sure that the worker at the register activates your gift card before you leave the store. iTunes cards only work when activated.
Keep in mind that there is tax on all of the songs you buy. If you don't leave a dollar or two for tax, it'll get charged to the credit card on your account.
source:
http://www.wikihow.com/Redeem-an-iTunes-Gift-Card