Cannot add switcher as menu item

Hi there, I am trying to add language switcher as a menu item.

I tried folowing this instructions: https://www.ads-software.com/support/topic/plugin-multisite-language-switcher-change-the-output?replies=18

But was not succesfull. I would like to have as a menu item and be displayed like the current version: https://freshforsale.com/

How could I add the code?

https://www.ads-software.com/plugins/multisite-language-switcher/