Hello,I am the person that will be helping you today.
You can use most any printing software to do so. May I ask, if you have Microsoft Word/Office, Mac Word, or any other similar piece of software? If you do not have a word processing application, you may download and install Open Office, which will allow you to print the 4x6 photos as you wish.
You can download a free version of Office called Open Office from the following link: http://download.openoffice.org/
- Download, save, and run that file
I will be standing by, looking forward to your response.