It looks as if you did have a postage option/price on the last item you sold. (Life of Picasso)
Ebay will have invoiced the buyer including the postage cost so don't ask them for the postage again!
Once the buyer pays, you will get sent the address to send to and it will show in 'order details'.
When you think about it, there is no reason for Ebay to provide the buyer's address until they have paid you.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)