Heidi, I'm not sure whether or not you already have a realtor, and add to what she or he is doing, or if you are going the For Sale By Owner Route. As others have said, you need to have a realtor to get it on Trulia. In addition to Trulia there are at a minimum of 30 other sights you can advertize on if you have an agent. Have your agent use Point 2 Agent and they will get you on many sites.
If you don't have an agent, I suggest you inquire and find a strong one to represent you. Statistics prove that you get about 15% more for your home when using an agent than when you sell it yourself, which means that even if you pay 6% you will still come out ahead in the end!
Good luck, I hope you do well in selling your home!
Your North San Diego County Realtor