NOTE: To edit the existing dashboard, you will need permission from the administrator.
Click on the My Dashboards
button in the designer title pane.
Next, navigate to the dashboard listing page.
Select a dashboard from the left panel to edit in the designer.
Click on the Edit
option from the context menu.
Alternatively, you can click on the edit icon from the dashboard listing.
The selected dashboard will then be opened in the designer as shown below.