Place your photo paper in the tray with the glossy or printable side facing down. Hold the paper by the edges to avoid fingerprints on the glossy surface. Slide the paper all the way in until it stops.
Moreover, which way do you print paper double sided?
Put the side to be printed on face up with the leading edge (top) of the paper in first. To print on the second side, put the paper face down, with the leading edge (top) of the paper in first. If letterhead paper is used, put it in with the heading face down and in first.