The organizer is PSE4's file manager and will not work with Lightroom since light room itself is an image manager. You have to choose one or the other.
LR will work with Elements (the editor portion) however. If not set as the default editor already, you can set it as the secondary editor in the Lightroom preferences.
If you want to use LR, then import the files into LR from the card reader and then export them to Elements when you want further editing refinement.