In order to use GEO referencing trigger, you need to Install and Activate this plugin:
NOTE: we are not the author of this plugin, so we can't guarantee technical support for it.
Once the plugin is Installed and Active, you need to conclude his DB installation clicking on Install now:
WARNING: From December 30, 2019 MaxMind made significant changes to how you access free GeoLite2 databases.
You will need to complete a FREE registration and obtain your license key:
Now you successfully unlocked advanced configuration on the User Triggers:
Country, the element will be visible (or hidden) for Users from selected Countries;
City, write the name of the City of the User. You can find the complete City list from here.