Normally, it will take 24 hours for the nameservers to resolve after modification. However, you can work with your site by enabling temporary URL till the domain is properly resolved.
(1) Login to WebsitePanel
(2) Select Domains icon
(3) Select your domain name from the Domains page
(4) Click Create Instant Alias link to create a temporary domain URL for your site and mailbox. You can use them till the DNS is completely propagated.
The details of temporary URL will be displayed after its creation. You can also delete the temporary URL after its creation.
This feature will be useful if you want to test your ASP.NET site before it goes live.
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