Shar, Once an album is created (click on Albums, then Create an Album). Then, before you upload, open the album you want the photo in by clicking n the album’s name or the icon next to the name. A window opens that is the same as the the photo upload window, and you upload the photo of your choice. When it has uploaded, it will be in both the album and your uploads.
I don’t think you can add photos to an album, once you have already uploaded without re-loading them again, and then they’ll be in the art gallery twice. Not sure if there is a work around to that.