[basma]

Can someone please tell me how to delete what I have searches in any website, its very distracting. I am using MacBook Pro, and the program is Safari. Please help..

[BenReilly]

Try going in the History Menu and press delete history at the bottom. That should take care of it. If not look for the file ~/Library/Safari/History.plist and rename it just in case.
(Im doing this out of memory, my ibook broke a few months back) anyway when you restart Safari the history.plist should be recreated and your url cache empty.