First, make sure if your Kinect is properly connected. Otherwise check your microphone settings on your Kinect. Or check the calibration of your microphone. For more information, look at this troubleshooting guide.
If your Kinect doesn't recognize your movements, try activating the 'Kinect On' setting found through the 'Menu', 'Settings', and 'Kinect' menus. You could also try adjusting the sensor angle or cleaning the camera lens. For more information, look at the troubleshooting guide.