Add the buses and trains for the journey, in the order they should appear on the phone. What is this?
Tap the other one to switch. These names show at the top of the phone page -- rename them if "school" isn't the journey.
A stop or station ("Nigel Road", "Peckham Rye"), or just the bus number ("37") to see where it stops. Pick the line going the right way -- the destination shown is where that bus is headed.
Nothing is saved anywhere. The whole route is inside the link itself, which is why it's long. Keep it -- it's the only copy. To change the route later, paste it back in below.