Open iTunes. If using a Mac click on "iTunes" at the top of the screen and select "Preferences" from the drop-down menu; choose "Edit" then "Preferences" if using Windows. Click on the green "iTunes Store" icon, select "Buy Using a Shopping Cart" and then click "OK."
Start shopping and adding your chosen songs to your shopping cart. Check the shopping cart by clicking on the "Shopping Cart" icon in the left-hand column underneath the "Store" header.
Review the your selection and the total cost by clicking on the "Shopping Cart" icon. Click on the "Buy Now" tab when you are happy with the contents of your shopping cart.