How do I insert my product into the printer tray so that it prints on the correct side?

In order to make sure that your project prints on the correct side, it's best to feed your paper through your printer's manual feed tray. There should be an icon on it that shows whether to place them face up or face down. You can run a practice sheet of plain paper through first and just mark it "up" on one side to see which side prints. When you click print, the printer dialog box has options to choose the manual feed tray and to choose to print on label stock instead of plain paper. There should also be a Help button if you want more information on your specific printer.