I'm Andrew, a community manager here in Trulia Voices, and so can speak on Trulia's behalf.
You can edit the details on your house by clicking on the "Edit Home Facts" button your home's profile page: http://i.imgur.com/6rlkf.png. You will be able to change details and add new ones, as well as any other special details you think should be included.
Can I help you with anything else?
Community Manager, Trulia Voices
You can have your agent claim your home's listing on this site so that he can edit the details to reflect that it is a 4 bedroom home. Speak to your agent about it as membership is free here on the Trulia site.
Good luck selling!
Prudential Connecticut Realty