In order to use Data Quality Dashboard you have to generate the data quality reports with Data Quality CLI. As the name suggests, Data Quality CLI is a command line interface, you just install it on your computer and it will generate some files on your computer. You can find in the README all about how to use it. Then you have to upload the generated files somewhere on the internet. We used GitHub for data so far and you can find details about it in this section.
For Data Quality Dashboard, you have to deploy the app on a server (we use Heroku). This involves the same steps described here and here. To make Data Quality Dashboard display your results, you have to set the value of
DATABASE_LOCATION to the URL to the files generated with Data Quality CLI (more in this section).
You can find a broader description of the workflow here. Hope this helps. If you encounter any issues or have further questions, don't hesitate to ask.