Allow Multisite
To enable the Network Setup menu item, you must first enable multisite in the wp-config.php file.
Open up wp-config.php and add this line above where it says /* That's all, stop editing! Happy blogging. */. If it doesn’t say that anywhere, then add the line somewhere above the first line that begins with require or include:
/* Multisite */ define( 'WP_ALLOW_MULTISITE', true );
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