Epson EPL-N2550 Series User Manual page 45

Unlock the lock levers.
Expand the paper cassette to accommodate the paper you are
loading, and lock the lock levers.
Note:
When loading A3 size paper, expand the paper cassette all the way
out until the A3 arrow mark is aligned opposite with the arrow mark
below the lock lever. When loading B4 or Legal (LGL) size paper,
expand the paper cassette until the B4/LG14 arrow mark is aligned
opposite with the arrow mark below the lock lever.
* Do not hold the roller when expanding the paper cassette.
Doing so may damage the paper cassette.
Paper Handling
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