Your ad or your listing? Listings typically syndicate automatically, provided your board is part of Listhub, or another syndication source. Our team has a few syndication sources like Century 21, Homes & Land, and two MLS boards.
Where are you experiencing difficulty specifically? Sometimes Trulia is indeed flaky and you may have to check to make sure your cookies are active. You can also try switching browsers. Firefox->Safari->Chrome->Internet Explorer, etc.