First go to the "Dashboards" section.
Select the dashboard you would like to edit from the drop-down list and then click on “Edit”.
This displays additional icons on your dashboard with which you can add new charts or delete existing ones.
Next, select the type of chart you would like and give it a title. All questions which can be displayed as that type of chart will then be displayed on the right. Select the one you would like to use as the "Data source".
Once you are happy with the dashboard, click “View” to save your changes.