JPGs have no inherent physical size (20" x 30"), just a resolution (3000 x 2000 or whatever).
So I think they don't want them as JPGs they probably want photoshop PSDs.
You should just be able to go File, New Image and then specify the size of the new image in physical dimensions (inches), paste the images and then drag the pasted images to resize.
Keep in mind blowing them up will reduce quality, what resolution are the screenshots?
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