Epson Stylus Photo RX600 Quick Start Manual page 8

Insert a few sheets of 4 × 6-inch Premium Glossy Photo Paper—
4
short edge first and shiny side up—against the right edge of the
sheet feeder, under the tab.
5 Press the sides of the left edge guide together and slide it against
the paper (but not too tightly). Make sure the paper is under the
tab on the left edge guide.
6 Flip the feeder guard back over the paper.
6