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This seems like a question for Trulia Customer service. They are very helpful. Generally, whatever you put in the MLS propagates to Trulia. Once the listing is associated with you, you should be able to log into Trulia, access the my listings section of your account http://www.trulia.com/account/listings/ click the open house link and enter the details. If you appreciate an answer, please give thumbs up. For the most helpful answer, please say thanks with a best answer click.