Hi Tami and Keith,
Kristan from Trulia's Customer Service here. Once you are logged into your Trulia profile, move your mouse to the top right corner of your screen and click on 'My Listings' from the drop down menu. Click on the 'For Sale' or 'For Rent' tab in the middle of your screen. Click on the 'Edit Listing' button for the listing you wish to edit. On the left side of the new window, click on Price and Details. Here, you can make any changes to the listing. Click on Save Price and Details when you have completed the changes.
Trulia is a host site, where information is sent to us from syndication websites. We do not pull listing data from the MLS, or any other site. agent and Brokers also have the ability to manually upload their listings onto Trulia.
If you have additional questions, please contact us at http://www.trulia.com/help/ask/ or call Customer Service at 1-888-466-3501.