To edit your account information, open CircleBack and press on your name at the bottom of the dashboard. The app will display the information listed in your profile. Press "Edit My Info" to edit the information in your profile. Once you have finished editing, press "Done" in the upper right corner.
To change your password, press the settings icon in the upper right corner of the app dashboard. In the Settings menu, press "Change Password". You'll be required to confirm your current password and then enter your new password. Once you are done, press "Save" in the upper right corner.