Hello,
The free version does not have any kind of settings page, to add the CAPTCHA to your contact form, you added [cf7ic] to your form editor just above the submit button.
If you have tried this and it is not working, there are a few things you can try.
If your site uses a speed optimization plugin with caching, please try to clear your site cache.
If you are trying to add toggle, remove toggle first and try it just as [cf7ic], if your site has any javaScript errors then it could prevent the toggle from working which would make it so the captcha won’t appear. If this is the case, I would be happy to take a look at your site to help you identify why it is not working, however, I cannot fix the errors if they are not produced by the Image CAPTCHA plugin.