First, wait a bit, sometimes emails take longer time to come.
Have you checked your spam folder? Sometimes email filters will make wrong decisions. If this happend to you, mark it as 'no spam' and probably your email filter won't make same error twice.
If you just registered to the service and haven't got the first email.. are you sure that you typed the email address correctly. Sometimes mistakes happens. If you have still your session open, just go back to the service, and send your registration email again. If you cannot find the list anymore, you will need to make it again. But don't worry, it is easy and goes fast!