Brother MFC 6890CDW - Manual (Page 184)

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a
Open the ink cartridge cover.
If one or more ink cartridges have
reached the end of their life, for example
Black, the LCD shows Cannot Print.
b
Press down to unlock the release lever
and take out the ink cartridge for the
color shown on the LCD.
c
Open the new ink cartridge bag for the
color shown on the LCD, and then take
out the ink cartridge.
d
Turn the green knob on the protective
yellow cap clockwise until it clicks to
release the vacuum seal, then remove
the cap (1).
e
Each color has its own correct position.
Insert the ink cartridge in the direction of
the arrow on the label.
1