The No-Plugin Guide for a Multilingual WordPress Site Using Multisite The No-Plugin Guide for a Multilingual WordPress Site Using Multisitehttps://wpmudev.com/blog/multilingual-wordpress-site-multisite/#creating-a-word-press-multisite-with-subdomainThe Ultimate Guide to WordPress Multisitehttps://wpmudev.com/blog/ultimate-guide-multisite/
Open up wp-config.php and add this line above where it says /* That's all, stop editing!