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Trying to figure out how to change slider in this template

Hi all! I got this problem. I purchased this template:

Problem I got is that I wanna add another slide in the slider section. Since there is text and stuff on top I just wanna copy/paste one of the two slides and make it into 4 of them. When I do so and changing images the same image appear in almost all of them. I am trying to figure out where and in which class I am suppost to change the value/name in order to make each slide unique?