Sync your iPhone to iTunes on our computer
Sync it to iTunes.
Plug in your iPhone. Connect to iTunes. Click Sync.
After you buy the music in the itunes store you have to sync it.
I had this problem too. I had iTunes installed already, but when I tried to sync my iPhone, nothing came up on my iPhone screen. I quit iTunes, and unplugged my iPhone, then plugged it back in and opened iTunes again.
You have to Sync it with iTunes.
Via iTunes, add the .ipa files to iTunes Library and sync with the iphone
Through iTunes on your PC or Mac. In there you sync it, with your iPhone.
You plug your iPhone into your computer, and then on the left it will say the name of your iPhone, right click on it and left click transfer purchases, and your done in Itunes.
You can as long as you have authorised your MacBook via iTunes.
Yeah, put it into Itunes and sync it with iphone
Well, to install iTunes on your computer you don't have to use your iPhone. You just go to the Apple website, and search iTunes, and then you can just download it from there. If you want to sync your iPhone with iTunes to back up your content, you just sign in with your Apple ID (if you have an iPhone you should already have one), then plug in your iPhone and press sync.