Are you selling your home? If so, are you trying to sell by owner? If that's the case, you can't do that here on Trulia. If it's listed with a Realtor, he/she will need to make the changes in the MLS, and/or claim the listing and manually make the changes here.
Or are you just editing home facts -- like the public records info? If so...my question to you is WHY?
I see people on here wanting to update the photos of their home, showing the cool new upgraded kitchen. But others want photos of their home removed for security and privacy reasons.
If there's an issue with accuracy in terms of # of bedrooms, bathrooms, square footage, etc. then you'll need to take that up with you county assessor's office. Trulia pulls public records data on homes from county websites. Again...why? If you're adding bedrooms, bathrooms or SF you get a nice new tax bill next year that is higher.
To make these change you can "claim" the property as the owner, and make changes that way. But again...I'd be careful about what you're doing and why.