This Post is part of SharePoint 2010 Installation Series
Content copied from here
To make full use of the server components you just installed, download the authoring tools to create and then publish your first Power Pivot-enabled workbook.
Open a port
If you are deploying a new server, you might need to open a port so that remote users can access your site.
- On the computer that hosts the Power Pivot server, click Control Panel, and then double-click Windows Firewall.
- Click Change Settings.
- Click Exceptions.
- Click Add port.
- In Name, enter a descriptive name, such as Port 80.
- In Port number, enter 80.
- For Protocol, use the default selection TCP.
- Click OK.
Grant Permissions
Users will need SharePoint permissions before they can publish or view workbooks. Be sure to grant Read permissions to users who need to need to view published workbooks and Contribute permissions to users who publish or manage workbooks. You must be a site collection administrator to grant permissions.
- In the site, click Site Actions.
- Click Site Permissions.
- Select the checkbox for the site collection Members group.
- On the ribbon, click Grant Permissions.
- Enter the Windows domain user or group accounts who should have permission to add or remove documents.
Do not use e-mail addresses or distribution groups unless the application is configured for Claims authentication. - Click OK.
- Select the checkbox for the site collection Visitors group.
- On the ribbon, click Grant Permissions.
- Enter the Windows domain user or group accounts who should have permission to view documents. As before, do not use e-mail addresses or distribution group if the application is configured for classic authentication.
- Click OK.
Install Power Pivot for Excel Add-in and Build a Power Pivot Workbook
After you have the server components installed in a farm, you can create your first Excel 2010 workbook that uses embedded Power Pivot data, and then publish it to a SharePoint library in a Web application.
Before you can build Excel workbooks that include Power Pivot data, you must start with an installation of Excel 2010, followed by the Power Pivot for Excel add-in that extends Excel to support Power Pivot data modeling.
For instructions on how to install Power Pivot for Excel and create Power Pivot data sources, see How to: Install the Power Pivot for Excel Add-in and Creating Power Pivot Workbooks in Excel.
Add Servers or Applications
Over time, if you determine that additional data storage and processing capability is needed, you can add a second Power Pivot for SharePoint server instance to the farm. For instructions, see How to: Scale a Power Pivot for SharePoint Deployment.
Pasted from <http://msdn.microsoft.com/en-us/library/ee210708(SQL.105).aspx>
After you install the Excel 2010 and Power Pivot for Excel 2010, use Power Pivot to create a workbook (say Test.xlsx).
b. Publish the workbook to the Shared Documents folder on the default Web site (http://machinename ).
c. Open SQL Server Management Studio, click Connect > Analysis Services and type http://<machinename>/Shared%20Documents/Test.xlsx into the Server Name field.
d. Click Connect.
A connection should appear in the Object Explorer and you should be able to browse the cube in your Excel workbook. This confirms that you have Power Pivot set up correctly.
Now that you have successfully installed and configured Power Pivot, you might want to configure Reporting Services on your SharePoint farm to enable additional functionality. Use the Reporting Services Installation and Configuration document to install and configure Reporting Services in SharePoint Integrated mode. You can then use Report Builder to create reports using Power Pivot workbooks that you have been published to a Power Pivot Gallery as data sources.