Canon I9900 Waste Ink Replacement How Do I Change The Ink Waste Absorber In My Canon I9900 Printer?

How do I change the ink waste absorber in my Canon i9900 printer? - canon i9900 waste ink replacement

I could not find detailed instructions (the manual) on exactly how to alter the absorption waste ink on Canon i9900 printer included. It is also necessary, set somehow?

I use this printer in my work, so any help would be greatly appreciated! Thank you!