Open the document you want to print
Click File
Click Print
Select your printer
Look for a setting called Print on Both Sides, Duplex Printing, or Two-Sided Printing
Turn that setting on
Choose whether to flip on the long edge or short edge if prompted
Check the page range and number of copies
Click Print
If your printer does not support automatic duplex printing, print the odd-numbered pages first
Reinsert the printed pages into the paper tray
Print the even-numbered pages on the other side
Make sure the paper is loaded in the correct orientation before printing the second side