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..

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.