Like many websites, Yahoo remembers the data you enter into its search box. This provides the convenience of easy access to previous searches you've performed. If you need to find information again, you can easily repeat a search by typing a few letters. The autocomplete feature then suggests previous searches you've performed. This feature is not controlled by Yahoo. It is controlled by the settings in your Internet browser. If you're sharing a computer, you can protect your privacy by deleting the search history from within your browser's settings.
Open Internet Explorer.
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Select "Tools," then "Internet Options."
Under "Personal Information," click "Autocomplete."
Click the box next to "Forms" to remove the check mark.
Click "Clear Forms." Click "Yes" to confirm.
Click "OK," then "OK" again to close the Internet Options window.
Close your browser and reopen it for the changes to take effect.
Open the Firefox browser.
Select "Tools," then "Options."
Click "Privacy" at the top of the Options window.
Under "History," remove the check from "Remember what I enter in forms and the search bar." Click "OK" to save changes and remove the current search history.