Picture 7:
Move 1 to 3: Remove the three screws with a plus screwdriver.
Move 4: Insert small minus screwdriver into marked opening. Careful move down hand so the backside will open up a bit.
Picture 8:
The backside opened up. For removing the side its opened wide enough. If Move 4 does not work right try to move screwdriver like in Move 5 and 6.
Picture 9:
Now lets go for the Side. Move 7 and 8 is same thing like Move 4.
Picture 10:
Side is already open now. The way to the waste ink tube is free.
Remove the Tubes (Move 10) from original place (Move 9).
(Move 11) I used the shortest way to lead them out of the printer.
Same steps just done backwards to get the printer back to work in no time.
InkRepublic CIS and R2400/R1800 Waste Ink Tube and Bottle Installation Video: