Have you searched the Online Help to find the answers to your questions?
Are you sure you want to permanently delete the following site structure?
This will also delete all of the site structure's content and data, including sections, pages, portals, images, and documents.
Are you sure you want to recrawl this site structure?
This process may take up to 30 minutes.
Are you sure you want to make this site structure your site's default site structure?
This will also swap all domains with the current default site structure.