You need to tell your agent about the site and they can list your home there, you are not able to do it your self. Tell them to use the below reference to do it. I know that in Keller Williams we have an internal MLS system that links directly into Trulia and other sites.
The link that Manuel provided below his answer is actually our sign up page for premium advertising for listings. If you are working with an agent, please direct him/her to the link below to submit your listing information to Trulia absolutely free of charge.
Customer Service Representative
You are approaching the busy season for any realtor if you are trying a FSOB miss the season you may not be able to sale your property. MLS is the most well known search engine to have a property listed and sold thru professionals.
We receive sooooo many calls or emails a week from seller trying to sale their home on their own found out they are now facing legal issues for not doing it correctly, it is tooooo late for a us as realtors to become involved.