ABBYY FineReader Express: How to scan multiple pages into one document?

Hi all! Ihave ABBYY FineReader express and have not used it in a while. I remember being able to scan multiple pages into one document but now Ican't remember how I did it and am not able to recreate it. Can anybody help? I thought I had a shortcut key for that but since upgrading to Yosemite some of all that has disappeared. Thanks for any help. I am considering upgrading to the pro version. Any comments on that?
Thanks,
Jim