Terms & Conditions (or "rules") must be added before the beginning of the campaign and will automatically appear in the footer of all pages. You can customize the text color.
Click on the settings icon at the top of your editor
Go to the 'Footer' tab and click on 'Upload'. You can then change the color of the text and even the text itself that will appear in the footer of your game.
The file is automatically saved, you can close this tab. Publish your campaign to put your changes online.