Change image path via ftp

Hi,

I have an odd question. One of my very old clients hired someone else after I worked for her because she wanted to change the width of the columns in the layout I created for her using ultimatum and I was too busy to acomodate her.

So after a year she wants to change her header image and some images I added to her layout. But nothing is working. She can′t update wordrpress or any themes and plugins because she will lose the changes the other dude did for her.

So I can′t change anything from inside WP because when I open the header layout O created with ultimatum I cannot edit anything.

She asks me if I can change these images via fpt. So I could do this, but the url of the images needs to change.

For example:

https://test.creatiburon.com/wp-content/uploads/2014/02/Banner-16-DE-FEBRERO.jpg

Needs to change to:

https://mamaenred.com/wp-content/uploads/2015/11/mama-en-red.jpg

And so on with 9 images more.

This happened because I messed up when I built that site, I didn’t know what I was doing back then. So I created the site in a test url and then uploaded it to her server but forgot to change the images urls. :S

I am sure that the guy she hired later edited the theme′s files, that’s why nothing is working now. So now her website is a complete mess. And when I went to change the images for her I realized that those images where on my server and I want to change that.

I am no expert in html, I do not know what file I should edit to change the url of the actual image to the new one. What I need to know is which file I need to edit so I can change the url path to the image.

I have looked inside style.css files of my theme and they are empty. Which is weird.