WangGuard Registration Notice Add-on is an Add-on for WangGuard plugin. You can add a Notice in the registration page.
Download and install WangGuard Registration Nocice Add-on
Activate plugins through the "Plugins" menu in WordPress (if is a Multisite, WangGuard needs to be activated for the Network)
Updates are automatic. Click on "Upgrade Automatically" if prompted from the admin menu. If you ever have to manually upgrade, simply deactivate, uninstall, and repeat the installation steps with the new version.