Here is a link to a post that has some good information on mirror image printing and what has worked for some other people. You should be able to go to Control Panel>Printers>right click on printer>Properties>under General tab click Printing Preferences>under Advanced Tab click Mirror Image ON. However, like i said others have had some issues with this. Hopefully you will find the link below helpful.
If I solved your post please mark it as solved to help others.
I'm a printer tech with HP.