Novice to Booking.com

I'm struggling with correcting and updating my property details.  I'd like help with the following:

1.  I'd like to remove our introductory discount for the first three bookings

2. Somehow I'm managed to create two listings, and so need to delete one.  It hasn't yet gone live.

3. One bedroom is showing both king and superking beds.  The king needs to be deleted

4. I've synced my calendar with AirBnB.  Do I need to sync both ways (export and import)?