Is your home listed for SALE with a Realtor? If so, you need to contact him/her. If you're just looking at the public records info, then my question is...why do you need this changed? Sometimes the public records data is incorrect for various reasons. For example, maybe the owner finished a basement or added bedrooms or baths without permits. If that's the case you're opening up a can of worms. Or maybe it's a typographical error. In any case, you can contact your county assessor and bring the errors to their attention. BUT...guess what?! You may get a nice tax increase! (i.e. if you're now reporting more SF, or more BR/BA than they previously had on record). Again...I'd ask yourself why you want to do this, and figure out what the ramifications will be.
FYI -- You're posting a question on a public website that pulls data from different sources. It is notoriously inaccurate. Nobody at Trulia is going to care if your information is incorrect. You should try and figure out where the inaccurate data is coming from address it at the source. Good luck!