Epson Y465ss127mo - Manual (Page 161)

4. Insert the paper along the left paper guide. Then, adjust the position
of the right paper guide so that it closely matches your paper’s width.
Be sure that the position of the guide allows the paper to move up
and down freely.
5. Push the paper levers back until the paper is clamped against the
guide rollers. The levers will not close completely if too much paper
is used. If this happens, remove some paper from the stack and try
again.
7-8 Using Printer Options