Here is a demonstration of how you can make the Password RBL API solution work for you. This is a mock-up of a typical account creation page. Go ahead and fill in the username and password fields with whatever you like, choose which API type and see the results from the API. Use one of your own passwords or choose from the many well known poor passwords (such as "password" or "12345").
The source code for this exact demonstration page (and server-side PHP code) is available to download. You'll get to see exactly how to implement the Password RBL API in your server-side form processing.
Real-time Password Blacklist