How to enable the new multisite feature in WordPress 3.0
Sunday, June 20, 2010 posted by Till
If you recently updated to or installed WordPress 3.0, you might wonder where the menu for Multisite feature is. By default, these new functions are disabled after a WordPress update, to enable them, edit the file wp-config.php and add the line
define(‘WP_ALLOW_MULTISITE’, true);
On your next login, you will see a new menu labeled “Super Admin” which contains the functions to add new sites to wordpress.

When I add this line to the wp-config.php file I get a new option under Tools named Network. Is this the same as the menu labeled Super Admin?
Yes, thats the menu for the multisite settings.