Not sure if caching is working

I just installed this plugin. When I test with pingdom and gtmetrix I get a near 0 score for leverage browser caching.

You need contact to your hosting provider.

I loaded my website https://www.pembrokeinstruments.com and refreshed twice. I don’t see anything at bottom of page. I use Impreza theme, latest version.

WPFC works properly. The user must be logged out for creating cache.

https://i.hizliresim.com/pgQdJn.png

How do you log in for creating cache?

If caching is working, why the low score from gtmetrix and pingdom?

because now WPFC is disable.

Now I am really confused. What diagnostic can verify WPFC is enabled and working OK?

now WPFC is enable in your site but you select all the checkboxes on the wpfc settings page.