Can't upload image as "heading" under slideshow" function (Debut theme)

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Under the slideshow section of the web design view, there is a header for each image where we can enter text and not anything else. How would I go about uploading an image overlay as this heading? 

Let's say I wanted my company logo to be an image overlay over the slideshow (so the slideshow images change but the logo overlay remains!). I'm using the Debut theme by the way.

I'm assuming some coding would be required? And if so, I could really use some help! Thank you!:)