Please help! Need images to post in vertical line instead of gallery. Debut theme.

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Hey! I am using the Debut theme. I want to add more images to each product page, but I want the images to appear one on top of the other (so you have to scroll down to see each image). Instead, it is adding them to a gallery so you have to click to switch images. I want the images to appear in a vertical line parallel to the product description to fill out the page more.

How can I make it so my images do not appear in a gallery, but instead show in a vertical line?

Any help is much appreciated! Thank you!