In order to register, you need to have an INFN Indico account.
As an external user, you can create an account by following the instructions described at the following link: https://agenda.infn.it/event/33324/page/7909-how-to-create-an-infn-indico-account-as-an-external-user (see last item on the menu on the left side of the conference webpage).
The registration fee amounts to 350 Euros (250 Euros for junior students) and mist be payed at the link https://agenda.infn.it/event/33324/page/7820-registration-fee-and-payment, by November 3, 2023, at 5:00 pm (Rome time)