It looks like you've already successfully added this open house date and time to your listing. I'm glad you were able to do that successfully. Please be sure to let us know if you have any other questions or feedback to share with us.
For those who have the same question, please note that open houses can only be added to homes that you've claimed on Trulia and added to the My Listings section of your account. Once a home is listed there, you will find options on the My Listings page to 'Edit listing' or 'Add Open House Times'.
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Americorp Real Estate
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