You can make minor customization by going to Administration -> Backend Pages
. Other than that you need to assign different roles for the users to access your content of the website. For now the dashboard cannot be customized as much as the other content ( some user roles to see only specific data ).
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items