FullLink is similar to Android Auto, and should be enabled as a default. Using your phone's charging cable, jack it in to the usb port on the central console, just below the infotainment unit. Select the icon on the infotainment screen that corresponds to the settings (looks like an 8-squared bar of chocolate). I think the actual button actually says FULL LINK. Press that, and a screen should open up which should show options. I have a Samsung phone, so my screen shows at the top SAMSUNG, then below it, it offers ANDROID AUTO, or FULL LINK. If you are intending to use Android Auto, select that on the screen. If your phone has a bespoke app (in my case, Samsung Car Mode), that should be your FullLink option.