We have a reservation in Centurion, So Africa and Airbnb is not showing it on our trips and also no where to put the reservation to find it. We want to add another day if possible
Well that doesn't sound right at all Kay and may suggest that this booking didn't go through for some reason.
Have you checked to see on the host calendar if your dates are showing still available? I would also contact the host immediately to see if they have a record of your reservation or not.