Hi Kel. If your home is listed for sale by an agent, then there are 2 ways to change this information. Both require your agent's assistance.
1) Your agent can update the information in the local Multiple Listing Service which will auto-populate the changes to Trulia within 24-72 hours.
2) Your agent can manually make the changes in Trulia - but updating the MLS is preferred because it will correct all search engines that gather info from this source.
If your home is not listed currently, then any information is from archived sources only.