Welcome to Trulia and thank you for your question. Please note that only listings that have been submitted to Trulia manually can be edited at this time and only those listings will be accompanied by a 'Refresh' button in the My Listings section of your account. Furthermore any updates you make to those listings won't be displayed automatically but rather within 24 hours.
Those listings submitted to us automatically need to be edited with the source that provides the listing information to us. You can find out who that source is if you click on the link or button to 'View more details' from the property page on our site. I then recommend that you contact the source in question to make sure that your listing information is updated both on their site and in the data feed they send to us. Once they update their feed our display will update automatically thereafter to display the new information.
Please let us know if you have any other questions or feedback for us.