Click on "forums" (upper left) and scroll down to the correct classified forum. This is much easier to do on a computer or laptop. Some of the features may not show up if you are on your phone especially in the portrait position. All ads that are posted in sale or wanted forums will have a option to close the ad when you either sell or find your item. " Mark [Sold] or Mark [Found] is just below the thread title above the first post.