After you finish installing Conseal Server, you will be given the address of the above page to browse to. (Windows users may find the page is loaded automatically). If you are not automatically redirected to this page when you first browse to the Conseal Server address, go to http://<your-server>/conseal/newinstall.
This page simply asks whether you have an existing or previous Conseal Server installation whose database (users, devices, configuration, etc.) you wish to use. If not, the installation will create a fresh database for you.