Have you designated BedBooking as Channel Manager on the Booking.com Extranet?
Prices and availability are updated on the basis of the data sent from BedBooking. This is why you can't manually edit prices and availability on the Booking.com Extranet.
Do you want to manually manage your offer's prices and availability on Booking.com once again?
Deactivate the data synchronization between BedBooking and Booking.com.