I have a Canon MG 7550 with two paper-cassettes. Standard is DIN A4 in cassette two. How can I change to cassette one with photo paper 13x18 cm ??? In the menu I can choose only between cassette and CD-Print.
Those settings have to be made in the printer driver which is accessed by the Page Setup button in the lower left-hand corner of the print module. You would have to check the instruction manual for the printer for information on how to specify which cassette to use.
The problem was that the settings were specified on DIN A4, Cassette 1 however can only hold paper to 13x18 cm.