How to multitask with YouTube playing on iPhone 4S?

I've tried looking on websites which say to play something on YouTube, press home button twice, slide the screen but across and press play and it should play what you were listening to on YouTube but when I do that it either plays the music on my phone or will not play anything at all, please help!

If you upgraded to iOS6, you won't have that feature b/c Youtube is a standalone app in that version.

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