There are two places you can edit your information on Change.org.
Edit Profile will enable you to change your name, age, location, Change.org shortcut, political affiliation, bio, and website. This controls your public information and what gets sent to petition targets.
Settings enables you to control your privacy, what causes appear on your profile, change your password and email address, email preferences, and the ability to close your account. This is where you would configure different preferences on your account.