Laptops usually have that [fn] button at the bottom left of the keyboard. You have to press that and the [prt sc] at the same time. Or if you happen to be in window mode... I've heard that if any part of the Fiesta window is off your screen (even by a pixel), it won't take a screenshot. So if you want screenshots, you may have to be in fullscreen.
Otherwise I have no idea. :/
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