Canon BJ-10sx - Manual (Page 86)

4. Insert the stack of paper into the sheet feeder.
5. Open the bin by pressing the bin release button on the
sheet feeder. (the bin release lever is on the top right side
of the sheet feeder when you are facing the front of the
printer.)
NOTE: Never force the paper bin. Always press the release
button to pen the bin.
6. Open the top cover on the printer.
7. Turn on the printer, and start your print operation.
NOTE: Always remove the sheet feeder before transporting the
printer.