Epson 5000/5500 - Manual (Page 81)

Cut-Sheet Feeders
2. Slide the left paper guide so it is aligned with the triangle mark.
Next, slide the right paper guide to roughly match the width of
your paper. Slide the paper support to midway between the
paper guides.
3. Pull the paper-set levers all the way forward until the paper
guides retract and lock open to allow for paper loading.
4. Take a stack of paper and fan it. Next, tap the side and bottom
of the paper on a flat surface to even up the stack.
CAUTION: Do not use multi-part forms, carbon paper, or
labels in the cut-sheet feeder.
4-4 Using Printer Options