Next to the item it will say something like 'buyer has not paid you can cancel for non-payment from ... '
The date will probably be 5 days after the sale.
You can then cancel using 'buyer did not pay', block the non-payer and send a second chance offer or relist.
"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)