Placement of secure seal code

I have some code from my payment gateway company for their secure seal logo/link
I would like the seal to go at the bottom of my home page (footer) in the middle or right side.
Not sure exactly where to place the code or if I can do it by CSS.
web site:

Hello there,

I hope you are doing well today.

In order to add that code, if it is a PHP code snippet then you can go to Appearance > Editor > Theme Footer and add the code there but if it is CSS then you would go to Appearance > Customize > Additional CSS and add it there.

Best Regards,

Thanks, worked