Canon BJ-230 - Manual (Page 26)

5. Slide in the sheet until it stops, and hold it for about two seconds.
The printer will automatically load the paper into position.
6. Start your print operation.
Loading Paper in Landscape Orientation
You can stack up to 100 sheets of plain letter-size paper in landscape
orientation in the sheet feeder.
NOTE: When printing on a transparency, insert the sheet so the
transparency side is facing you and the backing is toward the sheet feeder.
Insert the top of the transparency (where it is attached to its backing) into
the sheet feeder first.
NOTE: After printing on thick paper or envelopes, set the paper thickness
lever (inside the printer) back to the left position before printing on normal
paper.