How to do this?
Go to YouTube Feather Beta (http://www.youtube.com/feather_beta) page.
Click on the "Join Feather Beta"
And click on Join Waiting List
(https://friendstamilchat.in/forum/proxy.php?request=http%3A%2F%2F3.bp.blogspot.com%2F-smPlEGume00%2FUQJPloQJDOI%2FAAAAAAAAEOs%2FoN1gtTnQLW8%2Fs1600%2Fyoutube%2Bfeather%2Bbeta.JPG&hash=aac99ffce87b2d86a67df1eb65ddedbbf300fbdb)
That's all, now YouTube Feather beta will be enabled on your YouTube account.