Some small problems

Hello there @archeofoto,

hope you’re doing well and thanks for reaching us! 🙂

The first, most important, is that the Administrator and users don’t receive the confirmation email from contact form.
I have enabled the function in Email Notifications but it does not work. Exactly how should I fill in the fields? The administrator’s email for the plug-in is the main one on the site?

The default settings should be enough for making this work.
Keep in mind that admin user may have a different email than the WP General settings, so it’s better to use that one.
In order to make sure that emails are working in general though, please install the following plugins:
https://wordpress.org/plugins/check-email/
https://wordpress.org/plugins/wp-mail-logging/
You can then test that emails are getting out in general and then have some additional logs.

Also, can I translate the text of the “upload to file” button? (from “choose a file” to “scegli un file”) and the related text? (No file chosen). Last, the ultimate step of Pagination is “Finish” by default. Can I change it?

All these changes can be done by translating the plugin. A handy plugin to help you with that is Loco Translate: https://wordpress.org/plugins/loco-translate/

Warm regards,
Dimitris