Ciao (Hello),
I assume we are talking about this site?
Link
If so, even if you speak no italian you should be able to guess your way through the registration process.
Another tip would to have
another window open to translate a few words from Italian to English.
On the main page you are looking to the upper right corner.
Find the word "registrarti" and click on it
On the second page click on the top link which basically says you are older than 13 (almeno means "at least")
From there enter your desired username email address and password (utente = user/customer i.e. username)
Type in the numbers & letters shown to prove you are an actual person vice some webcrawling computer just trying to open 1000's of online accounts and you should be set.
Scroll down to set your language & time zone
Click accept
You will now get an email
Inside the email will be a link to verify your account/email.
You won't be able to login until you click the link emailed to you
I won't claim to speak Italian (even though I live here) but I can get buy with a few hundred words and an Italian phrase book written in English.
If this doesn't help I'm sure Stef will be along shortly.
Prego (You're welcome)