change permalinks

I developed my first website with the default permalink http://www.giacorri.it/?p=123. I would like to improve the above with the option No. 5 http://www.giacorri.it/articolo d’esempio / using your Redirectio plugin.
I then followed this procedure, thinking it might be valid for the whole site:
1) URL of departure: http://www.giacorri.it/?
2) Match: URL only
3) Action: Pass-through
4) Check URL: http://www.giacorri.it/articolo sample /
6) Click on Create addressing
When I tried I got the message: The requested URL / xxxxx / was not found on this server.
Maybe my skills are clouded by my age (76 years), so I can not think of how to solve this problem.
Can you please show me how to do?
thanks

https://wordpress.org/plugins/redirection/