by Chris » Thu Jun 03, 2010 11:35 am
By "Home screens filled," he meant the pages you have on your iPhone showing the installed apps. Older versions of the iPhone OS limited you to 9 pages/screens of app icons, but I believe that limit was increased to 11 pages in a newer version.
Double tapping the Home button on your iPhone should show the Search option.
The installation link Stuart provided is meant to be accessed directly from your iPhone using Safari--not from a Mac or PC or by using any other browser.