(2): Select the format (MP3, MP4, M4A) and the options for the conversion. The default options are for most videos a good setting.
(3): Press the 'Download' button at the bottom to start the conversion.
(4): This may take several minutes. After the conversion is finished you can download the converted file.
How to Save HD or Webm From the Homepage
YouTubedownload - MP4More...