Putting songs from iTunes to iPhone?

I have songs on iTunes but i downloaded them from "Youtube To mp3" and put them on iTunes. I'm trying to put my songs from iTunes onto my iPhone 4S but i can't figure it out, how does it work?

Hit Ctrl s to bring up sidebar. In the main iTunes window set the iPhone to be manually managed for music and video. Then you go back to iTunes music library and drag the files from there to the iPhone tab on sidebar. Many people recommend that you let iTunes manage your transfer when you sync. I've been using iPods since '07 and my current iPod is well over 3 years old and I've never relied on syncing for putting music on. In answering questions on this site whenever I see an iPod question with the word "sync", syncing is almost always the problem.

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