Help with customizing the main image @ buybudboston.com

I sincerely apologize if this is posted in the wrong area! I have been working with WordPress for 1 week so bear with me…

I want to change the main image (banner) which shows a finger placed onto a map. I have tried following a few suggestions I found online with no luck.

This is the image I want to change…. http://imgur.com/a/NsT7V

This is the image I want to update it to show (on all pages)…. https://i0.wp.com/buybudboston.com/wp-content/uploads/2017/07/baa1aa0fd22c5e868ec01092c6bb8b29.jpg?ssl=1

I tried using this method:

Geodirectory -> Design -> Scripts ->

ul li .geodir_featured_img {
background: rgba(0, 0, 0, 0) url(“https://i0.wp.com/buybudboston.com/wp-content/uploads/2017/07/baa1aa0fd22c5e868ec01092c6bb8b29.jpg?ssl=1”) no-repeat scroll 0 0;
}

and placing it in the Custom CSS place

But it does not affect the page.

How can I fix this? Thank you in advance!

buybudboston.com