Swap picture in slider plugin

I am a newbie with WordPress and at the risk of sounding totally clueless, can I swap a picture out of a swiper/slider in html? I did not develop the site. I normally only work in html using Dreamweaver and was asked to do this quick change. I have uploaded the new picture to the correct folder, but I have not found the spot in the cpanel where I can edit the html portion.

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