To do this, you must be using Safari; make sure you are not using Firefox or another program. This can be very useful for quickly finding information on web pages. Press Command F. This will open up a toolbar on the top of the page which will ask you what you are searching for. Type the word you are searching for into the toolbar. The word will be highlighted on the web page; you can then click the next arrows to find the section of the page you are looking for. This can be used to find specific news articles, in Google to make sure you have the result you are looking for, and is generally useful when searching the web.