How To Have Menu Shown with Uploaded Image & Titles

Hi, I am trying to style and set up the menu I have on the left of the site: https://prettyjacked.com

Right now, as you can see all of the menu items are shown as photos — which I added using Nav Menu Images plugging, but that’s not the issue as I could have also added them by replacing the title with an image code.

But I would like to have the title of the menu item shown over the images.

How do I code that? Right now I only have this:

‘<?php wp_nav_menu( array( ‘menu’ => ‘navigation-menu’, ‘container_class’ => ‘navigation-images’, ) ); ?>’

— and the pictures are uploaded directly through the Appearance > Menus tab.

And also, the menu looks funky when you select an item from the menu of images, for example:
https://prettyjacked.com/featured/ (which is the first link/image from the top)

I think it has something to do with the “current” css styles, but I deleted all of those codes from the child and parent themes. But as you can see there is a section in between some images with a different opacity than the rest. Actually opacity might not be the problem; it might have to do with the background turning white, and not black in those sections…

I’m not sure. But if someone can please help me out that would be great! And please let me know if you need me to clear anything up. Thanks.