There is a 30 – 60 minutes window between the registration of a NEW Domain and its information being ‘written’ to the Registry’s servers.
During this time, the domain is not fully active and therefore it is not able to publish any information associated to it.
Once this time period has passed, you should be able to view your website online through any Internet Browser.
If it has been more than an hour since you activated your Site Builder plan and registered a NEW Domain and your website is still not displaying, then please contact our Support Team, so that they can investigate further.