How to create a dashboard?
Click on the create (+) button on the left hand side
Select "Dashboard" to create a new dashboard
Add charts by clicking add charts in the center or the top right
Choose the charts by clicking on the tick boxes. One chart can only ever be added to one dashboard. A dashboard can contain charts from multiple studies. You can also add charts to dashboards via the action menu in the top right corner when you have the chart view open.
Once added, you can resize (bottom right corner), re-order via drag and drop (top left corner) and remove (top right corner) your charts again. Below the chart title you can see which elements you have selected.
Finally, give your dashboard a name and don't forget to save it