By all reports its pretty chaotic at the minute. Even if support could help getting on to them might be an impossible task at the moment. Do you have a solid sync light on your modem and did they say the service is active?
The modem needs to authenticate with a user name and password. Did they issue you with one that possibly came in the box or a card on its own? In the modem admin do you see a connect button or even the authentication section that asks for the username / password. What make, model is this modem?
It's not the WiFi password we are after it's a username password combination that is often an email address given to you when you sign up. In the old days they used your primary email address. At one stage it was built into the firmware so you didn't need to know it.