Open the pattern with a PDF viewer. We recommend using Adobe Reader which you can download here: https://get.adobe.com/reader/ at no charge. Please note: Our files are password protected for copyright reasons so you will not be able to open them with editing software. Before you print, make sure page scaling is turned OFF. The pattern needs to be printed at 100% or it will be not be correct. Print your test square first, you will find it on page 5, and measure it to check it that it has been printed to scale. When it measures correctly, print your required pattern pages.