Dashboards are the names along the top. You see the ones your account can open; if one you need is missing, ask for access. BP Map ↗ opens the territory map in its own tab.
Anything blue opens something. Each tile names its page in the corner (Sales ›), pill buttons open pages, and ← Summary takes you back.
To see the rows behind a number, click its bar, point or row. The grey Invoices › or Customer › button over that chart turns blue; click it.
Hover a customer for its last 12 months.
To start over, click Reset at the top right: every page of the dashboard goes back to the way it opens. It turns solid blue once you've clicked something. To undo just one click, click the same bar again, or an empty part of that chart.
Full screen: the button at the far right (Esc to leave).