Canon MF55DD Series Basic Manual page 97

3
Remove the new cartridge from its protective bag.
NOTE
Save the protective bag. You may need it later when you remove the cartridge from the
machine.
4
Rock the cartridge five or six times to distribute the toner evenly.
Instructions
5
Place the cartridge on a flat and stable surface. Grip the sealing
tape tab and snap it in the direction as shown below.
Make sure that the tab itself is detached from the cartridge.
Tab
Replacing the Cartridge
8
8-15