plugin not working for site registration

I have successfully installed this plugin, but the captcha is only working for the WP login page. Not the WP registration page and lost password page.
In the screenshots that come with this plugin I see that it is some setting that should solve it, but I can’t find this setting page in my WP admin.
In the setting page on WP I can only enter the site Key and secret Key generated at Google. But no option to set this captcha also for the registration and lost password page.
I have WP version 4.9.8