If you installed the demo, you could now open superset by typing <raspberry-pi-ip-adress>:8088 into the browser of your choice.
Once you are logged in, you can add a new database connection with the following URI: mysql://ubuntu:abcd@localhost:3306/crypto.
Then import the dashboard-file from the git repository folder templates/demo/superset_crypto.json.
Now you can access the dashboard.
If you want to see how the demo works, you can find the according files in the folder ~/projects/demo/.
Finally, if you want to disable the autostart of the demo, then enter the following two command lines:
systemctl disable superset_crypto_consumer && systemctl stop superset_crypto_consumer
systemctl disable superset_crypto_producer && systemctl stop superset_crypto_producer