It sounds like you either have a robots.txt file other than the Joomla one, or you are dealing with some wrong advice from the search engine.
You'll find the file in your main Joomla directory. If you installed Joomla in /public_html/ you find /public_html/robots.txt.
As for the content of this file, it should look like this...User-agent: *
Disallow: /administrator/
Disallow: /cache/
Disallow: /components/
Disallow: /images/
Disallow: /includes/
Disallow: /installation/
Disallow: /language/
Disallow: /libraries/
Disallow: /media/
Disallow: /modules/
Disallow: /plugins/
Disallow: /templates/
Disallow: /tmp/
Disallow: /xmlrpc/
Removing this doesn't allow a search engine to search your site's pages, it allows a search engine to go through your files. This is not a good thing and has nothing to do with your sites content. Your sites content in in the database, not these files.
The meta information can be found in "Global Configuration".