Go into Ebook store in your sony reader library to activate your reader device (PRS-600) if it is not showing up in your library.
http://www.kb.sony.com/selfservice/m...01445&fes=true
Once you activate your reader it will be listed on the left hand column in your library and then you can drag and drop books from your library books section on to your reader.
Another link I was provided by Sony during my challenges getting things started is
http://www.kb.sony.com/selfservice/m...01445&fes=true
It was harder than I expected to get things set up but once I did, I love it. I have wrist pain and have trouble holding a book open. Now I just touch the screen or tap a button to move through pages :-)