To use ASP.Net 4.0 from your account which using WebSitePanel/DotNetPanel, you may refer to the step as below,
1. Log into your Control Panel.
2. Select the Hosting Package such as EBiz Gold Windows.
3. Select the Web Sites option from right box.
4. Click on your domain (eg, domain.com).
5. Click on the Extensions tab.
6. Choose your ASP.Net version.