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. In Formatting Property click on General. In General click on Chart Line.

5. Enter Following details in chart controls:
Toggle Enable Title
Text: Sales in Countries
Font Size: 20
Font Weight: Bolder
Color: #000000
Background: #fa1818

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

7. Click on Preview and Save and Exit.

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