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To Add a Report to your Dashboard: Using the sidebar, choose the section and report you want. As demonstrated in the image, click the "Add to Dashboard" button, where the red arrow points.
To Remove a Report from your Dashboard: On your main dashboard screen, scroll down to the report you want to remove, and click the "x" in the upper right corner as demonstrated by the red arrow in this photo.

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To Change the Placment of a Report in your Dashboard: Simply drag and drop reports where you want them after they have been added to your dashboard.