How do I print in grayscale on Canon Pixma MP280? From my Macbook Pro (10.5.1), the print dialog has no grayscale option (screenshot below). 

I opened settings, and there is a color option in each Preset. The Presets are read-only. 

I guess I am supposed to click Duplicate and edit a copy, but the Duplicate button is disabled (screenshot at bottom), regardless of which of the three Presets is selected.

How do I print in grayscale or black-and-white?
To set Grayscale printing, click   Layout, then Quality &amp; Media.  Not the most obvious choices in an OS famed for UX!