Oki B4545 MFP - Manual (Page 17)

Installation
17
Loading paper
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Remove the cover from the printer paper tray.
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Press the paper size guide inside the tray on the right, in order to push both paper
size guides to the left or to the right.
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Put a stack of paper into the tray (do not put in more than 250 pages). In case of
letterhead paper, be sure to place the paper printed side up.
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Secure the stack of paper by pushing the paper size guides against the right and
left edges of the stack.
Caution - Do not add paper to the tray while the terminal is printing