Changing printer presets

I'd like to change 1 or more of my printer presets temporarily but I must be missing something obvious... I click File > Print, getting the print dialog. I click on Presets > Show Presets. If I want to change, say, the paper source, I click on Quality & Media, and this shows Paper Source set as Automatically Select. But I don't see any way to change this. What am I missing?

What am I missing?

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You didn't tell us which printer you're using but a generic answer....

If the printer has two trays to choose from, the printer driver should show an option to select which one to use. For example on some network printers there are trays for standard paper and also for legal size. If the option states automatically select, then you don't have a choice unless you're missing something.

Thanks, but all of my printer drivers are up to date. I have a Canon MX860, BTW, but regardless of what type of printer I have, I should be able to change the Presets, within the confines of the printer, obviously, right? I am simply unable to change the Presets.