Anna is correct, you'll want to ask your agent to either change the listing information at the source, or to make the changes manually on Trulia. You can always flag the listing by clicking on the small red flag icon in the row underneath the photos. This will allow you to make comments and sends the information directly to customer support. However, if we can't verify the changes you are requesting, we'll leave the listing as-is, so unless it's just displaying incorrectly on Trulia, it's probably best to go through your agent and have the changes made at the feed source.
Account Manager | Trulia