Once you make changes to your domain with the registrar you purchased your domain from, the changes will take 24-72 hours for the domain propagation to occur.
Domain propagation is the process of your registrar handing off the changes to your domain ISPs, ISPs to other ISPs and so on until you see the changes reflect on your computer with your internet service provider. Some service providers update their records more often than others and receive changes faster.
As a result of this, often you will not be able to get to your website by its domain name but a friend can. Simply wait until the changes have propagate through to your ISP. In the meantime we provide you an IP and temporary address in your welcome email which will allow you to start working on your site immediately.