How to get YouTube videos into iMovie?

Hello! I have a video I'm making in movie and I need to get some YouTube clips into movie. I've tried downloading Real Player, MPEG streamclip, QuickTime, and nothing seems to work. I've managed to get the YouTube clip into RealPlayer, but it stops there. Any and all advice is SO appreciated. I've... show more Hello! I have a video I'm making in movie and I need to get some YouTube clips into movie. I've tried downloading Real Player, MPEG streamclip, QuickTime, and nothing seems to work. I've managed to get the YouTube clip into RealPlayer, but it stops there. Any and all advice is SO appreciated. I've googled it a million times and can't quite get a clear, detailed, step-by-step answer. Can anyone please help me? Thanks, friend.
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