Convert Single to Multisite then add www to first site

I recently successfully changed a single installation to a multisite network with a subdomain set-up.

The network is on https://myurl.com/wp-admin/network with the first site on the network being https://myurl.com

I need to add www. to this first site so it uses https://www.myurl.com
(I don’t care if the network part has www. or not since I will be using the wpmu domain mapping plugin to add addation sites).

I’m using the media temple cloudflare feature they offer.

What do I need to do to change this properly?

Here is the bottom section of my wp-config and full .htaccess file:

/**
* For developers: WordPress debugging mode.
*
* Change this to true to enable the display of notices during development.
* It is strongly recommended that plugin and theme developers use WP_DEBUG
* in their development environments.
*/
define(‘WP_DEBUG’, false);
/* Multisite */
define( ‘WP_ALLOW_MULTISITE’, true );
define(‘MULTISITE’, true);
define(‘SUBDOMAIN_INSTALL’, true);
define(‘DOMAIN_CURRENT_SITE’, ‘myurl.com’);
define(‘PATH_CURRENT_SITE’, ‘/’);
define(‘SITE_ID_CURRENT_SITE’, 1);
define(‘BLOG_ID_CURRENT_SITE’, 1);

/* That’s all, stop editing! Happy blogging. */

/** Absolute path to the WordPress directory. */
if ( !defined(‘ABSPATH’) )
define(‘ABSPATH’, dirname(__FILE__) . ‘/’);

define( ‘SUNRISE’, ‘on’ );

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . ‘wp-settings.php’);

# BEGIN WordPress
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]

# add a trailing slash to /wp-admin
RewriteRule ^wp-admin$ wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ – [L]
RewriteRule ^(wp-(content|admin|includes).*) $1 [L]
RewriteRule ^(.*\.php)$ $1 [L]
RewriteRule . index.php [L]

# END WordPress

AddOutputFilterByType DEFLATE text/html text/plain text/xml
AddOutputFilterByType DEFLATE text/css application/x-javascript
AddOutputFilterByType DEFLATE text/css text/html text/plain text/xml text/javascript