Open your Expand App on your mobile device or navigate to the website at http://app.expandshare.com


On the Login Page there is a Forgot password link.  You can get to it here: https://app.expandshare.com/account/password_reset/


Make sure you use the same email address as your ExpandShare account.  You can double check it by finding your original invite email.


Follow the instructions to reset your password.