1. Click on hamburger icon.

2. Click on dashboard tab and open Line Chart in edit mode.

3. The Edit menu box appears as you click on Line chart icon. And a widget gets added in content place automatically in dashboard.

4. Enter Following detail in chart controls:

Optional Y Series Grouping: Year

5. From Chart icons select Stacked icon.

6. Fill above details in edit box, As Shown in figure.

7. Preview and Save and Exit.

8. Now, match your Line chart Stacked with the below example, it should look like the figure below: