Navigate to the KeepVid website. If you bookmarked the website, simply choose it from your bookmarks menu. Otherwise, you can click on this hyperlink: http://keepvid.com/
Next, locate the URL text box at the top of the KeepVid website. (This text box is highlighted in the picture above.)
Right-click on the text box and choose "Paste" from the pop up menu.
This will paste the web address (URL) of the video into the text box. Once this is done, press the button labeled "Download".