Maureen is correct - price changes need to be made with the source that sends your listing information to us. In your case that source is Keller Williams. Please contact them to ensure that any price updates for your listings are reflected on their site and also within the data feed they send to us. Once they update their feed, our display will update automatically with the new information thereafter.
Please let us know if you have any additional questions about this.
Also, for everyone's information: what Nash said below about editing the listing source is a valid option, however that option is only available to Trulia Pro subscribers. If anyone would like to learn more about Trulia Pro, please access the link below.