That's a great question and one that you really need to take seriously.
Here's what Trulia has to say regarding your question:
"Trulia receives this listing from ListHub, a third party listing provider. As part of Trulia's syndication agreement with ListHub, Trulia has agreed to limit data edits on core fields (e.g. price and status) specified by ListHub.
What this means, in English. Any data that influences value, (bedrooms, date of construction, SF, water front, garage, etc) can not be corrected......by you or the real estate professional. Further, you should understand the data displayed DOES NOT COME FROM THE MULTIPLE LISTING SERVICE.
In response to your question, "How do I put ALL the home facts?"
Answer: You can not.