How to replace the songs on an iPhone 5?

I have previously synced my phone with another computers music, but I've gotten a new macbook air and downloaded my songs on here. When I tried to sync the iphone 5 here the songs didn't convert. I'm probably just stupid, I know zilch about computers. But I'd really appreciate the help.

You can't put the songs from the phone onto iTunes unless you have the newest iTunes and a newer device with iCloud access, if you do then you can transfer without cords back and forth over internet, which is probably a little to advance if you don't know computers, so you probably wouldn't do that. Otherwise, it's just plugging into iTunes then click on the device on the left if in old iTunes and on the top right if on the newer iTunes and then clicking the music tab within the phones options and adding by checking what albums artist and songs you want on the phone, as well as apps, podcast, contacts, calendars, and so on. Then when done just click apply or sync in the bottom right corner of iTunes and wait for it to sync. Then once done eject the iPhone and enjoy!

The MacBook Air is new, under warranty, and it's PORTABLE!

So, take it, AND your iPhone 5, back to the Store where you bought the AIR.

And then, the people at the Genius Bar, will show you EXACTLY what you did wrong. WHY on Earth would you choose to Sync your iPhone to someone else's iTunes Account?

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