To check the model of your printer simply look at the text above the screen or on the sticker on the back. To scan to a USB do the following:
1. Plug the USB stick into the side of the screen (The ledge).
2. Click the "Scan to USB" icon that now appears. Sometimes it will automatically launch into the Scan to USB app.
3. Follow the options and click "ok".
4. Your documents will now scan to the USB. Only remove it once the printer has said its finished.