Make sure the stereo is on the setting “BT AUDIO” then on your phone go to Bluetooth settings and wait for KD-X482BT to appear and click on that on your phone. It should then come up saying “pair” on your phone click this button then also push the volume button in to accept the pairing on the stereo.

The instructions above are for the Beta 2S Self-Contained campervan and are similar for other Spaceships campervans (all have Bluetooth), although a different device name might appear in your phone's Bluetooth device list.