How do I load paper in the rear path?

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...or read this explanation:

1. Place the paper in the rear feed, to the left as seen from the rear, with the side that is to be printed on up. Align the paper with the left mark on the rear feed. Make sure that the sheet is square-on to the printer, and not skewed.
2. Push the paper into the printer, pushing it in as far as it will go.