Swapping out images on required pages

Hi!

So – for example, the /user-registration page has a background image that’s loaded, located in /wp-content/themes/arcane/img/ and is named registerbg.jpg

I cannot figure out how to replace the image file with one of my own. It appears the page cannot be edited using Visual Composer as does not detect any rows or elements etc. and, while I admit I am a beginner, I did open up a couple files (e.g., page-user-activation, page-templates.php) to try and figure out where and how the image loads on the page, but I did not see anything easily discerning.

I was able to figure out the name of the image file by using the developer console in Chrome, but I’m not experienced enough to figure out how to read the code and fully understand how it’s loaded.

ONE fix I was thinking, was for me to create a folder named “img” inside the child theme I created, and insert ‘my preferred image files’ using the same file names as in your theme’s img folder. Would that work?