Hi Don and Jan,
Welcome to Trulia and thank you for your question.
Only listings that have been manually submitted to Trulia can be edited at this time, except regarding property photos and open house times which are editable for all listings. We are working to make it possible for all listings to be edited directly on our site, but in the meantime you'll need to update your listings at their source.
It looks like we receive your listing information from Homes and Land in which case you'll want to contact them to ensure that they update the price information for your listings on their site and within the data feed they send to us. Once the update their feed, our display should update automatically with the new information.
I hope this helps you. Please let us know if you have any other questions or feedback for us.