You can share your airport tips by following these simple steps.
Go to the Trips screen → Open Flight.
Find the airport you want to add a tip about.
Click the Explore button.
Click the icon in the upper right corner.
Share your airport tips with others.
Go to the Trips screen → Select a flight.
Find the airport you want.
Go to the Airport tips.
Then click the "+" icon in the upper right corner of the screen.
Now you can share your own hint for the airport.