Epson EPL-N2010 Reference Manual page 33

For A3, B4, LGL or paper, extend the paper tray and orient
the paper with the short side of paper towards the printer.
If your printsouts are curled or do not stack properly when
using plain paper, try turning the stack over and reloading it.
6. Adjust the paper guide to the width of the paper.
At this time make sure the corners of the paper are under the
tabs on the left and right. Also adjust the paper guide clip
(vertical) with the paper.
7. Fit the cover over the sides of the paper cassette firmly to close
it.
8. Close the cover and insert the paper cassette into the printer. Make
sure the paper cassette is inside the printer as far as it will go.
2-4
Paper Handling