Hi Johannanel,
From the dashboard page you can click on the little wrench icon for any particular gadget and select the device shown in that gadget. You could also add new dashboards (represented by the tabs near the top of the screen, defaults "Health Dashboard" and "Events Dashboard") by clicking the "Add Dashboard" button in the top right corner. Once you add a new dashboard (tab) you populate it with gadgets and configure them to report on whatever device you're intereted in using the wrench icon as described above.
Best Regards,
Justin