If you don't have a Pandora account, you'll need to go to http://www.pandora.com on a computer to create an account.
1. Go to http://www.mysqueezebox.com and create a Squeezebox account.* From this site, you can download the Squeezebox server. Once that is installed, you'll need to associate your player with the Squeezebox server (your computer).
2. While you are on the mysqueezebox page, go to the App Gallery in your browser, select Pandora, and press Install.
3. Pandora will show in your apps on the Squeezebox, and you can create a station.
If you have further issues installing Pandora on your Squeezebox, contact Logitech for assistance:
Support Link: http://www.logitech.com/en-us/support-downloads
Email Support: http://logitech-en-amr.custhelp.com/app/utils/login_form/redirect/ask (Must Register First)
Phone Support: http://www.logitech.com/en-us/support-downloads/support-contactus?section=phone
More in depth instructions for installing applications on your Squeezebox are available here: http://wiki.slimdevices.com/index.php/BeginnersGuideOverview
*This feature may not be available outside the U.S.