To file a citizenship application you must:
Get a SPID identity (Public System Digital Identity.) The activation is free, and it can be done by an authorized provider listed on the website of the Agenzia per Italia Digitale. To register you need: an e-mail address: a mobile telephone number; a valid ID and a health insurance card with your fiscal code.
You can enter the platform by clicking on ‘Enter with Spid’ (Accedi con Spid)
Complete the digital request, attaching in the proper computer fields the following:
Personal ID;
Birth and criminal record certificate from country of origin;
Certificate of Italian language proficiency not inferior of CEFR B1 Level;
Receipt of payment of the mandatory €250 fee;
Proof of payment of €16 revenue stamp.
When the application is completed, it will be forwarded to the Prefecture that is responsible for summoning you.