You can change your default dashboard two different ways:
1. To change your default click "Manage Dashboards" under the Dashboard tab.
Once you're in the Manage Dashboards tab, click on the gear icon next to the dashboard that you would like to make your default dashboard. Select "Make My Default" to change the default dashboard to the one that you selected. This will then make the selected dashboard your default dashboard.
2. Change your default dashboard from the dashboard screen and click the name of your dashboard on the ride side of your screen. The name of the dashboard below is Demographic Dashboard. Select any of the dashboards from the dropdown to change your default dashboard.