I have a Photosmart 6510 B211a and when I print a picture from my iPhone it prints in 10x15cm. When I print a picture from my Macbook it automatically prints in A4. Both papersizes are installed in the printer.
How do I decide myself which size I will print in, so I can adjust it myself?
I have no way to print a picture in A4 from my iPhone and I can't get my Macbook to print in 10x15cm, since that size is not an option in the drop down menu.