To use AirPreview, make sure Diet Coda is open on your iPad. Then, in Coda on your Mac, click AirPreview, located at the bottom of the editor tab. A list of nearby iPads running Diet Coda will be displayed. Choose your iPad from the list. When instructed, point your iPad's camera at your Mac's screen to connect Diet Coda to Coda and begin your AirPreview session.