If you've paid for a year's subscription, you can place the ad in several topics with no problem. If you paid only for a 'one-off' ad, it can only go in one topic at a time. One of the many benefits of having an 'open' subscription. You could, I suppose, raise a 'Report', to ask the Mod team for indulgence, if there's no subscription. Might be worth a shot..? Hope this helps.