I'm sorry about the issue. Does this issue occur when copying on the print itself? Or when printing from the computer?
Do you see 2-sided option / setting on the printer's screen?
Do you see 2-sided option when going to the preferences/properties at the print dialog when printing on the computer?
Do you have windows xp, vista, or 7, or 8, 10, or mac computer?
What exactly have you tried exactly?
Please reply at the box below. Thank you.