To make any edit to your Marketplace Thread, you need to send $30 per thread to firstname.lastname@example.org. Make sure you put your user ID and thread link in the PayPal comments.
You then need to contact support and raise a ticket with the thread link, transaction ID and the email address you used to pay.
Once we've verified the payment (which can sometimes take up to 48 hours), we will make the changes and you'll be notified immediately.
Find out more information on editing your threads.