How do you change the waste ink on a Canon Multipass MP390?

My printer keeps saying I need to change the waste ink. I have so far found out that it is a sponge somewhere in the cartridge holder. I cannot figure out for the life of me how to get at it to rinse it or change it or whatever I have to do. Also, if you could provide the instructions to reset the printer so it... show more My printer keeps saying I need to change the waste ink. I have so far found out that it is a sponge somewhere in the cartridge holder. I cannot figure out for the life of me how to get at it to rinse it or change it or whatever I have to do. Also, if you could provide the instructions to reset the printer so it stops flashing waste in full at me. Thank you!
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