I'm sorry but Trulia does not accept for-sale-by-owner listings on their site. They say that this is a means to cut down on spammers abusing the site.
I suggest posting your home on Zillow.com and Craigslist.com as the service is free.
Prudential Connecticut Realty
An Affiliate of Berkshire Hathaway HomeServices of New England
I know this isn't made clear, and you're not the first (nor the last) person to question it.
However, only agent-listed homes may be posted here (for sale).
You can list on Zillow.com as a fsbo........or ForSaleByOwner.com, or Craigslist.com - just to name a few fsbo friendly sites.