VintageAntiques

Does anybody know how I can add a header image to this theme?

I would but this is the closest thing I could find to the exact look that the website owners are looking for. They want a brown background and there weren’t many other choices. Do you know how I would add an image to the header of this theme?

I have installed the plugin and placed the code onto a page on my website but the map is not showing up. What am I doing wrong?