When you went through the ordering process you created a new domain name and it was included in the Welcome email for your convenience. It often takes less than an hour for a new domain to become available on the internet, but it can take up to 24 hours.
Please wait awhile and use this website to test if your domain/website "is up." http://downforeveryoneorjustme.com This website is a handy tool to use anytime you want to check if a website is available on the internet.
If the new domain is working and you enter your domain name into a web browser then you should see a black and white page with "Index of /" or your initial website.
If enough time has passed and you still cannot access your website then please submit a ticket via the Client Center.