Canon IMAGEPRESS C7011VPS SERIES Operation Manual page 335

4.
Insert the new staple cartridge.
IMPORTANT
Use only staple cartridges intended for use in this machine.
NOTE
Only one staple cartridge can be inserted at a time.
5.
Gently push the staple case into the stapler unit, until it is securely in place.
Always make sure to insert the staple case as far as it can go.
6.
Below the stapler unit is the staple waste tray. Pull out the staple waste tray.
7.
Discard the staple waste.
Replacing the staple cartridge in the stapler unit
Chapter 13 - Add toner and staples 335