Zillow bought trulia - so you can do changes in zillow and they will populate in trulia.
Just go to zillow and search your address. When you find it, scroll down to 'Owners Section' and you can make a login, and then update the information listed about your home. Its best to do this BEFORE it's listed on the market, or the changes will be frozen for a while.
Feel free to contact me directly if you have any other further questions.
All the best,