My first subdomain site says no such address

Before trying to create my first site (other than the root) site on my network, I switched from path to subdomain install by making the changes WP Codex describes for wp-config.php and .htaccess. Then I created a new subdomain site via WP admin panel: . Unfortunately, Google Chrome cannot find this site. Am a skipping a step? Or did I do something wrong? Thanks, Ken