So ...

Upon activation, go to WP Security Questions => Plugin Settings to access the configuration page.

You'll see a "Setup Questions" page with a pre-defined list of security questions already setup:

Needless to say, you can also edit or remove the existing questions, and of course, at the bottom you'll see an "Add More" button that will allow you to add your own questions ...

Finally, at the bottom of the page you'll find the options that will allow you to enable or disable the security questions on the login, registration and lost password pages according to your needs:

OK. Now let's see the magic ...