Listings are sent to Trulia through a variety of feed sources such as partners, brokers, agents, third-party feed providers, or directly from an MLS. Edits to your listing on Trulia will need to be updated at the source of the listing. Since I do not have the address of your listing I am not certain where it is syndicating to Trulia from.
If your listing was posted on Trulia through Zillow Rental Manager, which is a partner site that syndicates listings to Trulia and other websites. You can remove your listing from Trulia by removing it from Zillow Rental Manger: http://www.zillow.com/rental-manager. You can deactivate your listing by clicking on Expire on the Listings page or by using the button at the top right of the listing's review page.To permanently delete your listing, click on Delete Listing at the bottom of the listing's left-hand navigation bar. This will erase all data for the listing.
Your listing will remove from Trulia within 24 hours once you expire it from Zillow.
Thank you for using Trulia!
Consumer Care Manager