Since Analysis for Office is an add-in to Microsoft Excel and PowerPoint, you launch it just as you would launch those applications. You can create a shortcut to launch it from your desktop or simply launch it from the Windows Program Files.
You can also launch Analysis for Excel from a SAP BW Application Server with transaction code RAAOE. To launch Analysis for PowerPoint, use transaction code RAAOP.
If necessary, you can enable or disable the add-in manually from the Files tab. Choose Options → Add-ins. From the Manage drop-down, choose COM Add-ins and then press Go. Check the Analysis box and choose OK.