Log in, fix your profile, claim your property under the my listings area and wait. Some people have had to claim listings more than once. Keep in mind that tru lia sells ads. Their interest is to make peopl ask questions and give away their contact information, not sell real estate.
(Please note: when you choose an answer as a Best Answer, or at least give a thumbs up, it helps those who answer questions here.)
If you are a licensed agent you can set up a profile and put all your listings here on Trulia. If, however, you are a for sale by owner who has contracted with a discount broker to put your home on the MLS you will need to contact the broker and find out if they have a feed to Trulia. Many agents have their listings fed automatically to Trulia through a syndication service.