Inserting sd photo memory card

Question

Hi, How and where do I insert my sd photo memory card in my psc 2410 photosmart all-in-one? There are 2 lower apertures on the rh side for memory cards but no indication as to the right way to insert it. Could you please explain clearly which way it should be facing, horizontal or vertical etc. I don't want to force it in the wrong way. Many thanks, Karen Weiss