Make sure there's still player space available ( remember the GM counts as one) and that the next game time is in the future. Also, I think free uses can only have two ads running, if that's a factor. Does it say listing active when you look at campaign details. it can also take 24 hours for a listing to show I think. if you give me the link to the listing I'll check I can see it, and will do a search of the listing.