Youtube Downloader

Go to youtube
Find the video you want to download
Look at the link in the address bar (it might look like https://www.youtube.com/watch?v=4dr5lN1jqRE&s=400&x=600)
You want the letters and numbers inbetween "v=" and "&" (so it would be "4dr5lN1jqRE")
That is the Video ID number
Put that number into the youtube downloader page.
Click download