Once you've installed it, you'll need to register your systems and create cockpit users that can access them. Steps for these tasks are in the SAP HANA Cockpit section of the SAP HANA Administration Guide.
Smart data streaming content was previously displayed as a series of tiles on the main page. Now, the links to streaming pages are collected into a single tile in the SAP HANA Options section at the bottom of the page (you can also get there by clicking SAP HANA Options from the bar at the top, shown above):
If you can't see this tile, make sure that you have the CATALOG READ system privilege on the database user you're connecting to this system with.
The streaming pages themselves are the same ones you're familiar with from earlier versions of cockpit: