This is the /etc/nginx/sites-available/anahita.local
I installed anahita in /var/www/
so the path is /var/www/anahita.local/
and the configuration.php is in /var/www/anahita.local/www/configuration.php
and by doing so, i am able to access the /var/www/anahita.local/www/index.php
on the browser localhost:80/index.php
It’s probably because Anahita tried to send you a confirmation email, but the server isn’t configured to do so. You can edit the configuration.php file and add the values for your mail server of choice. You can for example use an SMTP service such as Mailgun.