After making a booking at the Qatar Airways website, how long do I have to go to the "manage my bookings" site to enter in my personal details? Can I wait until a few days before my flight to do this and also to select my seat? Also, when I booked my ticket, the QR booking site would not allow me to enter a partner frequent flyer number if it contains letters (such as my US FF number). Will they be able to enter my FF number at the check-in counter?