Activate the SQLPowerPivot Help Collection
PowerPivot for SharePoint includes online help that you can access from pages in your SharePoint site. The online help provides information about PowerPivot application pages, plus links to updated content on the web.
The online help is installed but not activated. Use the following steps to activate help for your site collection.
In Site Actions, click Site Settings.
In Site Collection Administration, scroll to the bottom of the list.
Click Help settings.
Click the checkbox for SQL PowerPivot Add-in Help.
To verify that help is activated, click the SharePoint help icon. PowerPivot Help should appear in the list.
Repeat for other site collections that support PowerPivot data access.