To enable two-factor authentication for WordPress, log in to the administration area of WordPress. Then select the link Plugins > Installed Plugins.
Then find the plugin named Google Authenticator and click Activate.
After the plugin has been activated, it must be individually activated for the desired user account. To do this, switch to the user menu by hovering over the link User and then clicking All Users.
In the following menu you will find a list of all users. Click the user name for which you want to enable two-factor authentication.
Then scroll down until you see Google Authenticator Settings. Here you can enable two-factor authentication for the user and display the QR code. The QR code can be scanned with your smartphone by using the world4you App, which automatically detects the required data.
Once the settings have been made, scroll down to the bottom of the page and click the Update profile button.
After that, the two-factor authentication for WordPress is set up. The next time you log in to WordPress, you will have to open the app and enter the displayed security code. This additionally protects your WordPress account against attacks.