How do I get the scanner on a Canon Pixma MG5300 working?

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http://askubuntu.com – I have a canon pixma mg5300 series printer/scanner. I am able to print with it, after I successfully added the driver (if I remember correctly, I had to install it from the constructor, though I'm not sure, it was quite some time ago). However, I don't know how to use the scanner. I tried typing 'scan' in the dash, and a application named 'simple scan' appeared. Yet this application doesn't recognize the scanner, even though if I click 'print' on firefox, it recognizes the printer. How to scan with ubuntu 12.04 ? (HowTos)