To reset your billing portal password please follow the steps below:

1. Navigate to the login page: https://portal.squaretalk.com/login and click on the "Forgot password?":
 

2. Enter your email address that you use to login to the Billing Portal with and click on the "Send password reset link" button:

Afterwards follow the link that you received to reset your password.

In order to change your password for the Billing Portal, navigate to the Settings menu and change it from the "New Password" field and click "Update", here you can also enable "Two-factor authentication":