Signed into youtube, middle right of the top toolbar/screen it says upload with a down arrow. Click the down arrow and go to video manager. Your videos are listed and towards the right are different blue icons. Click that icon and it brings you to a page for the video with basic info etc. On the right it says Privacy Settings with a drop down menu, choose your new setting. At the end of the column it says save, click it.
As for the user account integration, I remember it was retarded and I had the same issue with it wanting to use my gmail account etc. Somehow I did something and kept my old username and needed a new password and whatnot. It still asks for my name but I just x out of the popup.
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