Each dashboard has 2 main sections:
Both of them are fully customizable by each user of the system
Customize the layout
Add or remove tabs\widgets simply press the Customize link and select the appropriate option:
Add Widgets
To add new widgets to a tab, simply press Customize->Add Widgets and check the widgets you want to add:
Change Widgets Layout
To changes the layout of the widgets in a tab, press Cutomize->Manage Widgets->Layout and select the preferred layout:
Remove Widgets
Press Customize->Manage Widgets, select the widget in the list and press the Remove link
Add Tabs
To add tabs to the dashboard, press Customize->Manage Tabs->Add Tab