I already registered....Numero Civico = Civic number, I just put my University ID there...as for CAP I have no idea and I just put two question marks over there.
Btw, numerico civico is really your street number -- the number that goes on your mailbox as part of your address, for example. CAP is postal code or ZIP code.
Even so, American fans are f*cked for a while. The site forces you to enter a "Country" if you are from gli Stati Uniti. (Here I presume "Country" means U.S. state.) But the wanker Juventus site developers in their infinite wisdom never added the logic to enter a dropdown or text box to enter your "Country", so the form prevents you from proceeding unless you say you're from some other country. Because the page does not allow you to enter the required field of "Country". Sheer genius Juventus English-launguage web site development, as usual.
Since I would actually like to receive something in the postal mail, like my membership card and any other materials, this is a problem. I wrote their customer service today in my best Italian, including a screenshot to illustrate the problem. Will let my fellow Americani know if they come back with any fixes.
Afterall, I'm going to be in Torino in October, and I better have my credentials!