Your agent doesn't know how to check a box. It's really that simple. Tell your agent to go into MLS, click on Tools, click on 3rd Party Data Transfers, click on Trulia, click the box that says it's ok to transfer data to 3rd party sources. Then supply your agent with an invoice for $500 for IT services performed, as you've just brought them out of the stone age and into the data age, and you've enabled ALL of their current listings to now be displayed on Trulia. Hopefully your agent will be smart enough to check the other 15 or so options that are also there, and then pitch it like they are the ones who go and put the listings on various websites, taking credit for what MLS does for you, at listing presentations.