If you wish to make a booking for just one single journey, select the Bookings tab in the app or click on the 'make a booking' button in the portal.
Enter the same date of the trip in both calendar boxes and tick the day of the week. You do not need to change the repeat every week section as the date entered will override this. Select confirm to finalise and confirm your booking.
See the full booking guide for both the app and the portal below: