Click “Slice Plate”, then click “Print Plate”. A pop up will appear where it shows your model, print time, and filament cost. That’s where you select what slot in the ams you want to use for the print.
If you’re talking about multi color printing, that’s set up elsewhere. I forgot exactly as I don’t have it right in front of me at the moment.
Hope that helps!
How do you like the difference?