Login and open your dashboard library by clicking "Dashboards" in the navigation menu.
1. Find the dashboard you want to remove and click the 'more options' icon to the right of it.
2. Click 'delete' in the options menu that appears.
Deleting a dashboard does not delete the visualizations it contains. They remain saved in your visualization library for future use.
Note: Deleting a Report is an irreversible action. Do not delete a report template unless you are 100% certain you want to do so.