To capture a screenshot of your CR-48 screen, press [ctrl]+[F5]. The [F5] key is the "window switcher" key, and is the 6th key from the left on the top row. The captured image is stored as a .JPG file in a "Screenshots" folder in your Downloads panel. (Press [ctrl]+[o] to open the panel.) You can view the image by clicking on it, or you can upload the image to several services (such as Google Docs, Picnik, and Aviary.)