We provide free instruction how to configure Trello Key and Trello Secret
1. Go to https://trello.com/app-key link and login with your credentials
1.1 Select I acknowledge that I have read and accept the Trello
1.2 Click on the "Show API Key" button.
2.1 Enter your "New Allowed Origin": http://www.yoursite.com
2.2 Click "Submit" button
3. Copy the generated "Key" and "Secret"