You can update your profile, password, and other information from within the mobile and web app. 

From a web browser:

Use the menu to access “Profile” where you may change your personal, driver, and payment information. To change password and notification settings, visit 'Settings' in the menu.

From the mobile app:

Use the menu to access “Settings,” and you’ll be brought to your account. From here, you will have the option to change password,  profile, and other account-related information.