4) Complete the rest of the on screen instructions.
It is possible to select a "one way" or "two way" connection with Booking.com. The normal case is "two way" which will both export inventory to Booking.com and import bookings from Booking.com. If you select any of the "one way" options only one of these actions will be automatically performed and the other must be manually maintained by you.
5) When ready you will receive a notification from Booking.com, go to the Channel Manager menu again and activate the connection.