Under Theme settings, you will find where to edit your footer. The footer is visible at the bottom of your advertising site.
The Theme chosen will determine the color of your footer. You will see a preview of the themes.
You can also add your Cookie declaration URL if you have an external cookie declaration you want to use.
Read more about how to edit your Color Themes: https://support.ocast.com/en/articles/6640292-color-themes