Thank you for using Trulia! You should be able to make manual changes for your listing within your Trulia account. These changes will only remain on our site for about 30 days before it expires. At that time, it will display the information from the your listing source data feed. It is best if you made the changes within your listing source provider such as your MLS or on windermere.com. Once you update that information, it takes approximately 24-48 hours to take effect on our site.
If you have additional questions, please contact us at http://www.trulia.com/help/ask/.