Well, if WP is installed into the root of your site that should be enough. If it is and it still doesn’t show up, then look for an index.htm or index.html file. Delete it. If it *still* doesn’t work, then you can do one of two things (or try both). Modify your .htaccess file to allow index.php to be a DocumentRoot, or contact your host to see if they can change it on the server.