How to makea ringtone for the iphone?

ive got an iphone and when ur on itunes pick the song u want to be ur ringtone and go to store on the top bar of itunes and click create ringtone
 
I bought it for my iphone and it's on there but it's not on my computer, do I have to buy it again then make a ringtone on the comp and send it to my phone or what?
 
I have a brand new macbook too with garage band but the track is on my phone not my computer, can I get it from my phone to my comp or do I have to buy it again?
 
yeah dude just plug your iphone into your macbook and sync it and then look at all the options for the iphone and there should be a checbox somewhere that says sync stuff from iphone to computer and then click apply and then sync it again and it should work
 
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