How can I add an ad widget to my website's footer?

[Pakistanpowerto]

Hello

I am running my ads on Locanto , and i want to add there Ad widget in Shopify Website Footer , how to add this Ad Widget in the footer attach picture

Website : www.pakistanpowertool.com

[MOISCHKOWITZ]

Does it look a little bit lie this on your backend in online-shop → theme → customize → footer