I have Windows 8, but can't merge music in iTunes?

I have some songs on my iPhone 5 already that I don't want to lose and I downloaded some songs from YouTube recently and can't seem to get the downloaded songs to merge with the songs that I already have.

Put the songs on the phone using itunes and then after it downloaded on your phone. Then go to the itunes app and go to more on the bottom right hand side and hit purchased and download the purchased ones

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