Monica
Hello Monica, thank you for your patience, your idea to summarise is great.
Yes, site is hosted here; when i try to change the password from phpmyadmin it still say "wrong user/psw", even by trying to use the MD5 you suggested (just to say, when I select MD5 the password I inserted get changed in some numeric and letter password different from the one I've add, anyway not working).
Yes, when i ask for password reset I'm not getting any email, even trying, as you suggested, to add a different email (I have tried with an @hotmail one), I still get this error "The email could not be sent. Your site may not be correctly configured to send emails".
Yes, I tried to use the login name instead of the email, still the same problem.
I can add that if I try to rename the plugin folders (disable them), do the login with the email and psw, i get this "There has been a critical error on this website. Please check your site admin email inbox for instructions." Important: for some reasons which I do not know, this happens only by trying to log in with the email; if I log in with user name and PSW i get the usual error "The password you entered for the username -- is incorrect. " This could be a clue someho, maybe.
I tried editing also the admin email in wp options and still nothing, i get the email sending error;
How can i modify to a default theme? I have found the template record in the wp-options, where the admin email was, and it is saying "Newspaper"... should I change this? with what?
My feeling is that somehow website is not communicating with the DB properly.
Thanks again for your time
UPDATE : I tried editing the voices "stylesheet" and "template" by changing the previous value "Newspaper" to "twentytwentythree". I cant see any changes and log in still not working...