If you do not know your current password and are logged out of the app select "Forgot password" on the sign in screen. This will bring you to our password recovery screen where you can enter your email address to request an email to reset your password. Once you receive the email you will click "Create a new password" to reset it.
If you do know your current password but would like to change it to something different, stay logged into the app. From there you can click 'More,' then 'Profile details' and lastly 'Change password.'