How to edit the WordPress footer

There is probably some CSS you can add via Additional CSS (in Theme CUstomization) that you could use. Use the Inspector tool of your browser (F12) to see the CSS ‘class’ element used in the footer. If the class is called ‘the_footer’, then add this to your Additional CSS:

.the_footer {color:white; background-color:black;}

Adjust it for what you like. In the Inspector, you can add CSS stuff to that element to try things out. There are googles/bings/ducks on how to use the Inspector.

Some themes have a footer ‘widget’ that you might be able to change.