I'm sorry it does not allow for sale by owner listings. If you search online, you will find other avenues to try.
Trulia does have access to many wonderful agents who can help you get the very best price in the shortest time for your home, however. If you have tried selling on your own and not been successful, please go to the agent directory on Trulia and select an agent with excellent reviews who works in your zipcode.
Good luck, and I hope you are successful!