Putting music on Samsung Rant?

I want to put music on my new Samsung Rant. I put the USB cable in, and i just thought I can take music from my Limewire and drag into the thing, but its telling me to do something. So I do it, it says to install the disk that came with the phone, It didn't come with a disk. So its telling me to "Check For A Solution" or "Browse My Computer For Driver Software".
How do I put music on this thing?