Go to the top of your trip page where the "search for location or park" bar is and type in your address, it will bring up your home icon on the map, click on it with your finger, then click more details, then add to trip.
So now on the top left when you click the "trips" options at the top left, scroll down and you'll notice your home address is at the bottom of the list. So then click and hold that last item and drag it to the top of your trip list. Your map will then reconfig. and show your home as your starting point.