After creating a dashboard, you can start adding widgets directly from the dashboard page, or save your data exploration results into the dashboard.
From dashboard view
From the dashboard view, you can add a new widget by clicking Add -> Add New Report to add a new report widget, or Add Text to add a text widget (More on Widget types below).
After selecting a dataset, the drag-and-drop UI will appear, and you can exploring and create visualizations.
From dataset exploration
While exploring data, you can also click Save, and select an existing dashboard to save your exploration result to it.
If the dashboard you desire is not available, you can also quickly create a new one in the report saving view.
To learn more about how to explore and save your result, visit Exploring Data with Datasets documentation page.