This worked for me. I hope it works for you!
You will need to have a USB cable that can hook from your printer to your computer.
Step one: unhook your modem
Step two : turn off your printer
Step three: wait 2-3 minutes
Step four: DO NOT hook up your modem until after you printed with the USB cable.
By doing this it must have reset my printer and I'm able to hook back online and print through my Wi-Fi. It's not giving me the "other computer printing" message anymore.
My neighbor had tried to print something (we both have Canon printers) for some reason hers did not print and I was stuck with the code.
I wrote Cannon a nice letter telling them that they need to put passwords on their Wi-Fi printing. Best of luck!
