I totally know how that goes, it's happened to me before too!
Head over to your main profile page, and select the 'Edit profile' link on the left side of the page. You can then expand the appropriate section to edit your email, password and Facebook Connect sign in information, your personal information like your display name and location, or the About Me section where you can write a summary about yourself that you want to share with the Trulia community.
Be sure to click the Save button at the bottom of the page to save your changes,and please note that logging out of your account will cause those changes will take effect immediately. If you have additional questions, please email me, firstname.lastname@example.org
Ali, Community Manager