How do I change the text displayed on the front end?

If you need to change default language in the component e.g. "No results found. Please widen your search area or choose a different zip code.".  You can update the language file provided using your FTP client.  

Locator stores all language strings in the Joomla language file.  These files are stored by Joomla according to the language.  For English, see

languages/en-GB/en-GB.com_locator.ini