Youtube help

I would like to set the following option:

I have a fast connection. Always play higher-quality video when it’s available.

I opted for this and saved the settings but each time I login I loose it and have to set manually.

How can I ensure that youtube doesn’t forget this setting?

Open an account, apparently http://www.ghacks.net/2008/11/14/youtube-high-quality-playback/

Once your account is set up, this might help:

http://img.photobucket.com/albums/v190/bob3160/Avast%20Forum/YouTubeSettings.png

What he mean by Fast Internet ? Like 10-100 mbit ?