If you are member you can login and remove ads (mark item as sold). You can write when and for how much is it sold for to help other buyers and sellers set their expectations. If you are not member and you want to do it yourself just signup with same email as you wrote when ad was placed.  OR

When you sell item e-mail us and we will make changes to show item is sold. Contact will be removed from all pages (your phone numbers, e-mail) so buyers can not contact you about items. For all ads SOLD will replace SALE and CLOSED will replace ACTIVE.