Should be as simple as plugging in your phone via the USB. Since its a demo model you may want to wipe the app connect data under factory settings. This will remove everything previously saved on the local storage.
BTW- you can now get Waze to appear on the screen, like the Apple maps. As long as the Waze navigation app is updated on your phone, you go to General in Settings on your iPhone, then CarPlay, and move the Waze button over to the CarPlay button selection. Much better than trying to watch it on your phone screen!