How do I manually print on both sides of the paper using Windows on the HP Laserjet Pro 400 MFP M425?

In your software's File menu, click Print, select the product, click Properties or Preferences, then click the Finishing tab and select 'Print on both sides (manually).' After the first side prints, retrieve the stack from the output bin, place it in Tray 1 with the printed side down and the top of the pages toward the product in the same orientation, then press OK on the control panel to print the second side. (Pages 10-11)