Why can't itunes locate my songs?

So I just downloaded a bunch of songs from youtube & right when I was gonna put them on my iphone itunes said it couldn't locate any of the songs? I have no idea where to find them!

LAWL n00b

If you have a Mac look in Finder and then Downloads. Locate them and move them to the iTunes folder.
If you have a PC and use Explorer, Open Start>My Computer>. Drive>Users>Your Name>Downloads.
If you use Firefox, press Start>All Programs>Mozilla Firefox>Downloads.

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