You can use a table of contents to provide an index of the different pages in a dashboard:
You can drag the Table of Contents control in from the left hand set of dashboard controls into your dashboard. We recommend dragging the Table of Contents into a page of its own, usually the first page on the dashboard:
The Table of Contents will automatically populate based on what's in your dashboard. You can add descriptions to different page sections by clicking on the Edit link next to a page label and choosing 'Configure Page Description' from the dropdown menu:
Once done, save and View the dashboard to see the table of contents appear.