How do I use my USB data cable for my Samsung phone?

I have a USB data cable for my Samsung A 737. I bought a ringtone (I did not steal it, just so you know) and it is saved on my computer. How do I get it from my laptop to my buzz using the cable? P.S. I have a Mac, but Windows users feel free to answer too, it may help. I really need new ringtones! Thank you!

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