I need to know how to choose a duplex print option for this printer.

I assume that printer is perfectly installed and
for both side printing,

go to
contro panner ->printer and faxes->right click on printer->select properties->at bottom click on preferences -> choose "duplex printing".

if you cannot duplex printing here need to install duplex printing.

HP 2015n is not able to print duplex (both sides). HP printers, which have duplex print have "d" after the product name/number - like HP2015dn, 2055dn.

Try turning Duplex off at the printer. See if that does what you want.

Make sure the manula paper feed slot is closed.
Access Printer Properties or Printing Preferences
Select the Finishing Tab
Select Print on Both Sides
Select OK
Then print the document(s)

It is called a manual duplexing option, the bottom rung of the duplexing ladder, you phisically have to take out the peice of paper after one side is printed, turn it over and reinsert it

http://www.retrevo.com/r/258bh050/38/Printing+on+both+sides+%28duplexing+manually%29#q=HP+2550L

Sir, the Hp LaserJet 2015n printer CANNOT automatically do duplex printing since the printer does not include mechanism and paper storage areas to cycle the paper through the printer a second time and print on the reverse side. Manual duplex printing can be done as follows: Choose duplex printing and remove all sheets after the printing is complete. Turn the sheets over while preserving the orientation and insert them in the paper feed path. I have an HP 1020 laserjet printer which is similar to the 2015.

in the printer driver setting there is option to turn on manual duplex printing.
Go to printer driver properties go to printing default under printing default there is a option called finishing in finishing print on both sides is mentioned select that option and i m sure it should work

On the workstation go into Control Panel, select Printers, highlight the proper printer, Right Click for secondary menu and choose Properties.

Select Device Settings tab, look under Installable Options, Click on Duplex Options field and select proper setting.

This may differ from printer makes and models.

as i know, usb-printers don't support both side printing. It is words of the generant

The HP Laserjet 4+ does not have duplex capability built in; you'd need to purchase and attach the duplex unit (HP part number C3157A) to have that option.

Depending on your operating system, your driver may support a "manual duplex" mode in which you print one side, reload the paper, and then print the other side. You can also "fake" this from many applications (such as MS Office / OpenOffice) by telling it to print only even-numbered pages, then printing only odd-numbered pages.