If you entered your delivery address incorrectly and the seller has not yet posted the tickets, please contact them directly and provide them with the correct delivery address. You can find their contact details at the bottom of your purchase confirmation email.
If the tickets have already been posted, please contact your seller directly to let them know that the delivery address was incorrect as it's likely that the tickets will be returned to the sender. If they are returned to the sender, you will need to organise the re-delivery of the tickets with them and also pay any additional delivery costs.