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To manage your videos click on the Video Manager icon just above your channel art on the left side or select Video Manger from the drop down arrow on the upload button.icon in the top right corner of the page just to the right of the upload button (if you have loaded an image it will appear in the icon).
You then want to click on the "creator studio" button.
You can then click on the Video Manage link in the left hand box titled "Creator Studio".
From here you can do a number of things to your videos including:
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