Sorry for the delayed response with printing a mirrored image. What software are you using to print (Word, Photoshop, etc)? Quite often this setting is found in your software.
In this link to Microsoft Office support regarding Word, this will tell you how to do it. If this link does not help you, I will have to know what operating system is on your computer as well as the software you are trying to print from (for example: Windows 7, Mac OS 10.8, etc) and I will be happy to help.